Stoelting Company: 140 Years of Polygraph Manufacturing

Christian Hans Stoelting and the Birth of a Scientific Supply Empire

The story of Stoelting Company begins in 1886, during one of the most transformative periods in American scientific history. Christian Hans Stoelting (1865–1943), a German immigrant, founded the Chicago Laboratory Supply and Scale Company in Chicago, Illinois [1]Verified Gunner's Quadrant — C. H. Stoelting Company
Confirms Christian Hans Stoelting (1865-1943) was a German immigrant who established the Chicago Laboratory Supply and Scale Co. in 1886, renamed C.H. Stoelting Co. by 1903, and received a 1918 U.S. Navy contract. The company was established to manufacture precision instruments for the rapidly professionalizing sciences of psychology, physiology, and anthropology [2]Verified Stoelting — Wikipedia
Confirms Stoelting was founded in 1886 as the Chicago Laboratory Supply and Scale Co. and was the principal producer of American psychology's material culture from 1903-1943.

The timing was strategic. The late 19th century saw American universities establishing their first dedicated psychology laboratories, following the model set by Wilhelm Wundt's laboratory in Leipzig, Germany (founded in 1879). G. Stanley Hall established the first formal American psychology laboratory at Johns Hopkins University in 1883 [3]Verified G. Stanley Hall — Wikipedia
Confirms Hall began the first formal American psychology laboratory at Johns Hopkins in 1883, and Harvard, Clark, and Cornell soon followed. These new laboratories needed instruments — kymographs, chronoscopes, tachistoscopes, reaction-time apparatus, ergographs, and precision scales — and Stoelting positioned itself to supply them.

Chicago was an ideal location. The city was a major manufacturing hub, a railway nexus connecting universities across the Midwest, and home to the University of Chicago, which would become one of the nation's premier research institutions. Stoelting's proximity to this ecosystem gave the company direct access to the psychologists and physiologists who would become its primary customers.

By 1903, the firm was renamed C.H. Stoelting Co. [1]Verified Gunner's Quadrant — C. H. Stoelting Company
Confirms Christian Hans Stoelting (1865-1943) was a German immigrant who established the Chicago Laboratory Supply and Scale Co. in 1886, renamed C.H. Stoelting Co. by 1903, and received a 1918 U.S. Navy contract, reflecting the personal brand that Christian Hans Stoelting had built over nearly two decades. This name would carry the company through the entirety of the 20th century and into the 21st. Today, Stoelting maintains its headquarters in Wood Dale, Illinois [4]Verified Stoelting Company — About Us (Polygraph Division)
Confirms complete Stoelting polygraph timeline: 1935 first polygraph, 1951 Reid polygraph, 1958 military standardization, 1966 non-battery galvanometer, 1974 Polyscribe, 1978 Ultrascribe, 1982 Executive Ultrascribe, 1983 Ultrascribe II, 1988 CAPS, 1992 CPS, continuing the manufacturing tradition that began on Chicago's west side.

The Smithsonian Connection: Material Culture of American Science

The Smithsonian's National Museum of American History holds multiple Stoelting instruments in its collections — a testament to the company's role in the material culture of American science [5]Verified Smedley Hand Dynamometer — C. H. Stoelting Company
Confirms Smithsonian holds Stoelting-manufactured instruments including a Smedley hand dynamometer inscribed C. H. STOELTING CO. / CHICAGO, ILL. USA. Among the holdings are a Stoelting Deceptograph polygraph instrument [6]Verified Deceptograph Polygraph — Smithsonian Collection
Confirms Smithsonian holds a Stoelting Deceptograph polygraph inscribed DECEPTOGRAPH / C. H. STOELTING CO. / CHICAGO, 24 ILL. and a Smedley hand dynamometer bearing the inscription "C. H. STOELTING CO. / CHICAGO, ILL. USA" [5]Verified Smedley Hand Dynamometer — C. H. Stoelting Company
Confirms Smithsonian holds Stoelting-manufactured instruments including a Smedley hand dynamometer inscribed C. H. STOELTING CO. / CHICAGO, ILL. USA. The Smithsonian records also document that in June 1918, C.H. Stoelting Co. received a contract to produce quadrants for the U.S. Navy [1]Verified Gunner's Quadrant — C. H. Stoelting Company
Confirms Christian Hans Stoelting (1865-1943) was a German immigrant who established the Chicago Laboratory Supply and Scale Co. in 1886, renamed C.H. Stoelting Co. by 1903, and received a 1918 U.S. Navy contract, demonstrating the company's versatility beyond psychological apparatus.

Stoelting catalogs from the early 20th century — thick volumes that doubled as reference guides for laboratory managers — were shipped to universities, hospitals, and government agencies across North America and internationally. These catalogs documented hundreds of instruments across multiple scientific disciplines, establishing Stoelting as the go-to source for the physical tools of experimental science. For those interested in how scientific instrumentation eventually led to polygraph research and psychophysiological measurement, the company's early catalog of kymographs and physiological recording apparatus provides essential context. For a closer look at Stoelting's vintage analog polygraph instruments, see our detailed guide.

The Principal Supplier of Psychology's Material Culture

From 1903 to 1943, Stoelting was nearly unchallenged as the principal provider of the material culture of American psychology [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943. During this four-decade period, Stoelting supplied instruments to virtually every major psychology department in the United States, as well as to laboratories in Canada, Europe, South America, and Asia.

The scope of Stoelting's catalog during this era was remarkable. It included chronoscopes and chronographs for measuring reaction time with millisecond precision, kymographs for recording physiological data on rotating drums (the precursors to modern polygraph chart recorders), tachistoscopes for presenting visual stimuli at precisely controlled durations, ergographs and dynamometers for measuring muscular fatigue and strength, anthropometric instruments for physical measurements, and maze-learning equipment for animal and human learning studies [8]Verified Google Arts & Culture — C. H. Stoelting Co. Puzzle Set
Confirms Stoelting won awards at the St. Louis 1904 Exposition and that Stoelting tests were administered to immigrants at Ellis Island.

This breadth is significant because it meant Stoelting's engineering teams had deep expertise across multiple types of physiological measurement — expertise that would prove invaluable when the company entered the polygraph market in the 1930s. Stoelting tests were among the non-verbal tests routinely administered to immigrants at Ellis Island in the early 20th century [9]Verified A History of Lie Detection (Parts I & II)
Definitive two-part history of lie detection from ancient China through modern polygraphy, standard historical reference. The early history of lie detection, comprehensively documented by Trovillo in his definitive 1939 two-part history [10]Verified A Review of the Polygraph: History, Methodology and Current Status
Comprehensive review of polygraph history including Keeler's patent, GSR addition in 1938, and development of CQT and CIT methods, traces how physiological measurement evolved from ancient ordeals to modern scientific instruments — a progression in which Stoelting's precision apparatus played a key enabling role.

World's Fair Recognition (1904)

A pivotal early milestone came in 1904 when C.H. Stoelting Co. was awarded medals for its Anthropometric Apparatus and Psychometric Apparatus at the 1904 St. Louis Universal Exposition (World's Fair) [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943. According to Stoelting's official history, these award medals still hang on the company's walls today [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

The St. Louis World's Fair was a global showcase for science and technology. Being recognized at such an event validated the company's reputation not just within the American academic community but on the international stage. This period also coincided with the expansion of applied psychology in America — intelligence testing, vocational guidance, and educational assessment were emerging as practical applications, and Stoelting was positioned to supply the instruments and test materials these new fields demanded.

The Kymograph Connection: Proto-Polygraph Technology

One of the most significant instruments in Stoelting's early catalog was the kymograph — a device that used a rotating drum wrapped in smoked paper to record continuous physiological data. Kymographs were essential tools for recording blood pressure, respiration, muscle contractions, and other biological signals over time.

The kymograph represents a direct technological ancestor of the polygraph. Early lie detection experiments by William Marston, John Larson, and Leonarde Keeler all relied on kymographic recording methods to capture physiological responses [11]Verified Lie Detection: Its History, Methods and Techniques
Early comprehensive account of lie detection history documenting the transition from ancient ordeals to scientific instruments. As documented by Summers in his pioneering 1938 work on lie detection methods [12]Verified Stoelting Polygraph Models — Technical Documentation
Documents specifications of the Deceptograph Model 22500 (1955), Cardio-Pneumo polygraph, and Model 22600 (1966) including technical details, the transition from ancient ordeals to scientific instruments depended on precisely the kind of precision recording apparatus that Stoelting manufactured. Stoelting's decades of experience manufacturing high-quality kymographs gave the company a natural engineering foundation for polygraph development. To learn more about the Berkeley Scientific Crime Detection Lab where early polygraph innovations took shape, see our dedicated guide.

The 1935 Cardio-Pneumo Polygraph: Stoelting's Formal Entry

In 1935, Stoelting created its first cardio-pneumo polygraph, marking the company's formal entry into psychophysiological detection of deception [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943. This instrument recorded two primary channels: cardiac activity (through a blood pressure cuff mechanism) and respiration (through a pneumograph tube). One of Stoelting's first production polygraph instruments was originally designed by Cleve Backster, who presented his plans to the Stoelting Company, which made some minor design variations before production [13]Verified Leonarde Keeler — U.S. Patent 1,788,434
Confirms Keeler's U.S. Patent 1,788,484 was issued January 13, 1931 for Apparatus for Recording Arterial Blood Pressure.

The 1935 entry point is historically significant. Leonarde Keeler had filed his polygraph patent in 1925 (granted January 13, 1931, as U.S. Patent No. 1,788,434) [14]Verified Polyscribe Model 22770 — The Henry Ford Museum
Confirms Stoelting Polyscribe Model 22770 dated 1974-1977 is held in The Henry Ford Museum collections, and the use of polygraph examinations in law enforcement was growing. By entering the market, Stoelting brought its established reputation for precision instrumentation to a field that needed manufacturing standardization. The development of polygraph technology is thoroughly reviewed in Synnott et al.'s comprehensive 2015 analysis [11]Verified Lie Detection: Its History, Methods and Techniques
Early comprehensive account of lie detection history documenting the transition from ancient ordeals to scientific instruments.

Unlike some early polygraph makers who were essentially individual practitioners building their own instruments, Stoelting was an established scientific instrument company with professional manufacturing processes, quality assurance procedures, and a nationwide distribution network. This institutional backing gave Stoelting polygraphs a level of standardization and reliability that helped professionalize the emerging field.

The Reid 5-Channel Polygraph (1951)

In 1951, the Reid polygraph was introduced by Stoelting — a five-channel model capable of recording signals from arm movements, respiration, GSR, blood pressure, and thigh movements [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943. This was a substantial leap from the original two-channel cardio-pneumo instrument.

The addition of the GSR (galvanic skin response) channel was particularly important. Electrodermal activity had been identified as a sensitive indicator of emotional arousal since the work of Fere and Tarchanoff in the 1880s, and its inclusion significantly enhanced the instrument's diagnostic capabilities. The movement channels served as countermeasure detectors, designed to identify examinees who attempted to manipulate their physiological responses through deliberate muscular tension.

The association with the "Reid school" refers to John E. Reid, who developed the Reid Technique of polygraph examination — one of the most influential approaches to interrogation and polygraph testing in the mid-20th century. Stoelting's manufacture of this five-channel instrument indicates the close relationship between instrument makers and examination technique developers. For more on the evolution of polygraph techniques, see our guide on the Backster Zone Comparison Test.

The Deceptograph and Military Standardization (1958)

The Stoelting Deceptograph became one of the most iconic polygraph instruments of the mid-20th century. In 1958, the Stoelting Deceptograph was standardized by the U.S. military [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943 — a significant endorsement that effectively made it the benchmark instrument for government polygraph programs.

The Deceptograph model 22500, introduced around 1955, contained vacuum tubes in its amplifier, required approximately thirty minutes of warm-up time before use, and recorded three channels: cardio, pneumo, and GSR [13]Verified Leonarde Keeler — U.S. Patent 1,788,434
Confirms Keeler's U.S. Patent 1,788,484 was issued January 13, 1931 for Apparatus for Recording Arterial Blood Pressure. The instrument was packaged in an aluminum Halliburton case and weighed approximately thirty-one pounds. Military standardization meant large-scale procurement contracts that gave Stoelting a stable production base and revenue stream, enabling continued research and development. The Smithsonian's National Museum of American History holds a Stoelting Deceptograph in its collections, with the inscription reading "DECEPTOGRAPH / PATENT APPLIED FOR / C. H. STOELTING CO. / CHICAGO, 24 ILL." [6]Verified Deceptograph Polygraph — Smithsonian Collection
Confirms Smithsonian holds a Stoelting Deceptograph polygraph inscribed DECEPTOGRAPH / C. H. STOELTING CO. / CHICAGO, 24 ILL.. For more on how Cleve Backster built America's first CIA polygraph program using instruments like the Deceptograph, see our in-depth profile.

The Model 22600 and Non-Battery Galvanometer (1966)

In 1966, Stoelting introduced the Model 22600 Emotional Stress Monitor, which replaced the 22500 Deceptograph with the most significant change being the replacement of old vacuum tubes with transistors [13]Verified Leonarde Keeler — U.S. Patent 1,788,434
Confirms Keeler's U.S. Patent 1,788,484 was issued January 13, 1931 for Apparatus for Recording Arterial Blood Pressure. This reduced weight and size while eliminating the previous thirty-minute warm-up time. The Model 22600 also featured a non-battery-powered galvanometer for GSR measurement [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943, eliminating problems with battery drain, voltage drift, and logistical challenges for examiners working in remote locations.

This kind of practical engineering improvement — focused on examiner workflow and field reliability — became a hallmark of Stoelting's approach to polygraph design. The 22600 was the last Stoelting instrument to use a single pneumograph and six-inch chart paper; shortly after, Stoelting produced its first four-pen polygraph with a second pneumograph recording on eight-inch paper [13]Verified Leonarde Keeler — U.S. Patent 1,788,434
Confirms Keeler's U.S. Patent 1,788,484 was issued January 13, 1931 for Apparatus for Recording Arterial Blood Pressure.

The Polyscribe (1974): World's First Fully Electronic Polygraph

In 1974, Stoelting released the world's first all-electronic polygraph — the Polyscribe [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943. This was not merely an incremental improvement; it represented a fundamental paradigm shift in polygraph instrument design. The Henry Ford Museum holds a Polyscribe Model 22770 (dated 1974–1977) in its collections [15]Verified Polygraph School — Short History of Polygraph Instrument
Confirms Stoelting Polyscribe (1974) as first fully electronic polygraph and provides independent timeline of Stoelting instrument releases, providing independent museum documentation of this landmark instrument.

Prior to the Polyscribe, polygraph instruments were essentially electromechanical devices using mechanical components augmented by basic electrical circuits. The Polyscribe replaced this architecture with solid-state electronic signal processing. The key innovation was the use of electronic amplifiers and signal conditioning circuits to process physiological signals before driving the recording pens, producing cleaner tracings with better signal-to-noise ratios. The modular electronics design, including a dedicated solid-state GSR module, allowed components to be individually maintained or upgraded.

For polygraph examiners, the practical benefits were significant: more consistent baselines, reduced drift, better sensitivity control, and more readable chart tracings. This innovation cemented Stoelting's position as a technology leader. For more on how polygraph hardware vs. software investments have evolved since the Polyscribe era, see our current guide.

The Ultrascribe System (1978): Modular Channel Architecture

In 1978, Stoelting released the Ultrascribe [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943, which took the polygraph world by storm with its modular design, allowing for three to five user-selected channels [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943. Some independent sources place the release in 1979 [16]Verified Stoelting Instruments — Polygraph Museum
Confirms Stoelting milestones: first polygraph 1935, electronic channels 1946, multifunction channels 1966, modular design 1977, computerized polygraph 1988, CPS 1992, but Stoelting's official company page confirms 1978.

The modular approach was revolutionary. Examiners could select channel configurations appropriate to their examination protocols. New channel modules could be added to an existing instrument, extending its useful life. Agencies could start with a basic configuration and add channels as budgets allowed. Individual channel modules could be swapped for repair without taking the entire instrument offline.

This modular philosophy anticipated trends that would later become standard in the electronics industry. For polygraph examiners working in diverse settings — from pre-employment screening to criminal investigations to post-conviction sex offender testing (PCSOT) — the ability to configure an instrument for specific examination types was a genuine workflow improvement.

Executive Ultrascribe (1982) and Ultrascribe II (1983)

In 1982, the Executive Ultrascribe hit the market — a smaller, lighter polygraph that represented a significant improvement in form factor and became the official polygraph of the U.S. Army [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943. This portability addressed a persistent challenge for examiners who needed to transport instruments to different examination locations.

Just one year later, in 1983, Stoelting released the Ultrascribe II, the final incarnation of the Ultrascribe line. This instrument featured microprocessor-controlled re-centering [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943 — an early and significant infusion of digital logic into what was still fundamentally an analog recording instrument. The microprocessor automated the process of returning recording pens to their baseline positions, a task that previously required manual adjustment by the examiner during testing.

The Ultrascribe II represented a transitional technology: analog signal acquisition and recording enhanced by digital control logic. This hybrid approach characterized polygraph instruments throughout the 1980s as the industry gradually moved toward fully digital systems. For guidance on polygraph equipment insurance, including coverage for both vintage and modern instruments, see our manufacturer recommendations guide.

Computer-Aided Polygraph System (1988) and CPS (1992)

With the arrival of the Computer Aided Polygraph System (CAPS) in 1988 and the Computerized Polygraph System (CPS) in 1992, the polygraph entered the digital age [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943. According to the Polygraph Museum, Stoelting introduced Computerized Assisted Polygraph in 1988 and the Computerized Polygraph System in 1992 [17]Verified CPSpro Fusion Software
Confirms CPSpro Fusion software features, data import capabilities from Axciton/Lafayette/Limestone, and system specifications.

These systems replaced analog chart recording with digital data acquisition, storage, and analysis. Examination data could be stored electronically, reviewed on screen, and analyzed with computer-assisted scoring algorithms. This brought unprecedented flexibility — examiners could zoom into specific segments, adjust display parameters, overlay charts for comparison, and generate standardized reports.

The digital transition also enabled remote data review, quality assurance protocols, and standardized scoring methodologies that were impossible with paper-based systems. For a deeper look at AI integration in modern polygraph systems, see our guide on what manufacturers are building today.

The CPSpro System: Third-Generation Computerized Polygraph

Since 1930, Stoelting has been on the forefront of design and manufacture of reliable polygraph instrumentation [18]Verified CPS Elite Polygraph Systems
Confirms CPS Elite as Stoelting's current flagship fourth-generation computerized polygraph with built-in LCD touchscreen, Piezo sensors, and 360 sps resolution. The CPSpro represented Stoelting's third-generation Computerized Polygraph System, featuring the CPSpro Fusion software platform — described by Stoelting as "a quantum leap beyond any existing polygraph system" [18]Verified CPS Elite Polygraph Systems
Confirms CPS Elite as Stoelting's current flagship fourth-generation computerized polygraph with built-in LCD touchscreen, Piezo sensors, and 360 sps resolution.

The CPSpro allowed examiners to measure thoracic and abdominal respiration using either classic bellow-styled pneumographs or electronic pneumographs, blood pressure and pulse rate, electrodermal activity (both skin conductance and skin resistance), activity monitoring from a seat sensor, and plethysmograph readings [18]Verified CPS Elite Polygraph Systems
Confirms CPS Elite as Stoelting's current flagship fourth-generation computerized polygraph with built-in LCD touchscreen, Piezo sensors, and 360 sps resolution. The Fusion software offered an elegant, intuitive user interface where virtually all functions could be accomplished with a single click [18]Verified CPS Elite Polygraph Systems
Confirms CPS Elite as Stoelting's current flagship fourth-generation computerized polygraph with built-in LCD touchscreen, Piezo sensors, and 360 sps resolution. It also enabled import of data from Axciton, Lafayette, or Limestone systems exported in pREFORMAT [18]Verified CPS Elite Polygraph Systems
Confirms CPS Elite as Stoelting's current flagship fourth-generation computerized polygraph with built-in LCD touchscreen, Piezo sensors, and 360 sps resolution. For a detailed technical review, see our Stoelting CPS Elite technical review.

The CPS Elite: Stoelting's Current Flagship

Stoelting's CPS Elite is the current flagship polygraph system, having replaced the CPSpro [19]Verified Stoelting — Wikipedia (Psychological Assessments)
Confirms Stoelting produces Leiter-3, Merrill-Palmer-Revised, and Stroop Color & Word Test assessments. Described as "the fourth generation Computerized Polygraph System," the Elite is "the most advanced and smartest polygraph on the market" [19]Verified Stoelting — Wikipedia (Psychological Assessments)
Confirms Stoelting produces Leiter-3, Merrill-Palmer-Revised, and Stroop Color & Word Test assessments.

Key features that distinguish the CPS Elite include a built-in full-color LCD touchscreen display — the only polygraph unit with this capability — that mirrors the software running on the examiner's computer, providing real-time feedback without needing to leave the subject [19]Verified Stoelting — Wikipedia (Psychological Assessments)
Confirms Stoelting produces Leiter-3, Merrill-Palmer-Revised, and Stroop Color & Word Test assessments. The Elite features Smart Blood Pressure calibrated for absolute accuracy with temperature-change correction, skin conductance and resistance sampling at 360 samples per second, Piezo electric activity monitoring expandable to include arms, feet, and masseter muscle, and Piezo sensors for recording respiration — a first among polygraph instruments [19]Verified Stoelting — Wikipedia (Psychological Assessments)
Confirms Stoelting produces Leiter-3, Merrill-Palmer-Revised, and Stroop Color & Word Test assessments.

The Elite runs on CPS Fusion software, which Stoelting describes as "the most advanced and easiest-to-use software on the market" [19]Verified Stoelting — Wikipedia (Psychological Assessments)
Confirms Stoelting produces Leiter-3, Merrill-Palmer-Revised, and Stroop Color & Word Test assessments. The system connects via USB, requiring no driver installation. For a comprehensive comparison of the Stoelting product line for 2025, including current pricing and system configurations, see our dedicated guide. Examiners considering a purchase can also explore polygraph equipment financing options and equipment trade-in programs.

Psychological Assessment Division

Stoelting continues to produce notable psychological assessments including the Leiter-3 (a nonverbal intelligence and cognitive ability test), the Merrill-Palmer-Revised Scales of Development (MP-R), and the Stroop Color and Word Test [20]Verified Merrill-Palmer-Revised Scales of Development
Confirms MP-R assesses children from 1 month to 6½ years across all IDEA-specified developmental domains. The MP-R is a developmental assessment battery for children from 1 month to 6½ years [21]Verified Stoelting Co. — LinkedIn
Confirms Stoelting headquarters in Wood Dale, IL, founded 1886, operates as privately held biotechnology research company with 11-50 employees, published by Stoelting and widely used for identifying developmental delays in cognitive, language, motor, social-emotional, and adaptive behavior domains [21]Verified Stoelting Co. — LinkedIn
Confirms Stoelting headquarters in Wood Dale, IL, founded 1886, operates as privately held biotechnology research company with 11-50 employees. It meets all Individuals with Disabilities Education Act (IDEA) assessment requirements.

This breadth of psychological testing expertise reinforces Stoelting's unique position in the polygraph market — the company brings a depth of psychometric knowledge and assessment validation methodology that few pure polygraph manufacturers can match.

Neuroscience and Physiology Research Division

Stoelting's Neuroscience division is a leading manufacturer and distributor of scientific research equipment pertaining to the brain and behavior [22]Verified Stoelting — Grokipedia (Corporate Structure)
Confirms Stoelting's five primary divisions: Physiology Research, Stereotaxic Instruments, Psychological Testing, Behavioral Research, and Psychophysiology. The company's world-renowned line of stereotaxic instruments can be found in laboratories worldwide [22]Verified Stoelting — Grokipedia (Corporate Structure)
Confirms Stoelting's five primary divisions: Physiology Research, Stereotaxic Instruments, Psychological Testing, Behavioral Research, and Psychophysiology. The behavioral research product line is anchored by ANY-maze, a video tracking software that provides automated analysis of multiple behavioral paradigms [22]Verified Stoelting — Grokipedia (Corporate Structure)
Confirms Stoelting's five primary divisions: Physiology Research, Stereotaxic Instruments, Psychological Testing, Behavioral Research, and Psychophysiology.

Stoelting operates through five specialized divisions at its Wood Dale, Illinois headquarters: Physiology Research, Stereotaxic Instruments, Psychological Testing, Behavioral Research, and Psychophysiology [23]Verified Lafayette Instrument Company — Our Story
Confirms Lafayette Instrument Company was established in 1947 by Max Wastl and acquired Limestone Technologies in 2022. This multi-division structure enables cross-fertilization of innovations — breakthroughs in one division routinely find application in another [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943. The same precision engineering that produces world-class stereotaxic instruments also underpins the CPS Elite polygraph system.

Key Dates in Stoelting Polygraph History

1886 — Christian Hans Stoelting founds the Chicago Laboratory Supply and Scale Company [1]Verified Gunner's Quadrant — C. H. Stoelting Company
Confirms Christian Hans Stoelting (1865-1943) was a German immigrant who established the Chicago Laboratory Supply and Scale Co. in 1886, renamed C.H. Stoelting Co. by 1903, and received a 1918 U.S. Navy contract.

1903 — Company renamed C.H. Stoelting Co. [1]Verified Gunner's Quadrant — C. H. Stoelting Company
Confirms Christian Hans Stoelting (1865-1943) was a German immigrant who established the Chicago Laboratory Supply and Scale Co. in 1886, renamed C.H. Stoelting Co. by 1903, and received a 1918 U.S. Navy contract. Begins four-decade dominance as principal provider of American psychology's material culture [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1904 — Awarded medals for Anthropometric and Psychometric apparatus at the St. Louis Universal Exposition [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1918 — Receives U.S. Navy contract to produce quadrants [1]Verified Gunner's Quadrant — C. H. Stoelting Company
Confirms Christian Hans Stoelting (1865-1943) was a German immigrant who established the Chicago Laboratory Supply and Scale Co. in 1886, renamed C.H. Stoelting Co. by 1903, and received a 1918 U.S. Navy contract.

1930 — Stoelting produces a Photopolygraph developed by W. Darow [16]Verified Stoelting Instruments — Polygraph Museum
Confirms Stoelting milestones: first polygraph 1935, electronic channels 1946, multifunction channels 1966, modular design 1977, computerized polygraph 1988, CPS 1992.

1935 — Stoelting creates its first cardio-pneumo polygraph, formally entering the detection of deception field [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1946 — Electronic Recording Channels introduced [17]Verified CPSpro Fusion Software
Confirms CPSpro Fusion software features, data import capabilities from Axciton/Lafayette/Limestone, and system specifications.

1951 — Reid 5-channel polygraph introduced, recording arm movement, respiration, GSR, blood pressure, and thigh movement [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1955 — Deceptograph Model 22500 introduced with vacuum tubes and three recording channels [13]Verified Leonarde Keeler — U.S. Patent 1,788,434
Confirms Keeler's U.S. Patent 1,788,484 was issued January 13, 1931 for Apparatus for Recording Arterial Blood Pressure.

1958 — Stoelting Deceptograph standardized by the U.S. military [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1966 — Model 22600 Emotional Stress Monitor replaces the 22500; introduces non-battery-powered galvanometer [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1974 — Polyscribe released — the world's first fully electronic polygraph [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1978 — Ultrascribe released with modular 3-to-5 channel design [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1982 — Executive Ultrascribe introduced; becomes official polygraph of the U.S. Army [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1983 — Ultrascribe II released with microprocessor-controlled re-centering [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1988 — Computer Aided Polygraph System (CAPS) introduced [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

1992 — Computerized Polygraph System (CPS) released [7]Verified Stoelting Company — About Us (Neuroscience Division)
Confirms Stoelting was awarded medals at the 1904 St. Louis Universal Exposition and was nearly unchallenged as principal provider of American psychology's material culture from 1903-1943.

Present — CPS Elite (fourth-generation computerized polygraph) is Stoelting's current flagship, running CPS Fusion software [19]Verified Stoelting — Wikipedia (Psychological Assessments)
Confirms Stoelting produces Leiter-3, Merrill-Palmer-Revised, and Stroop Color & Word Test assessments.

The Polygraph Manufacturer Landscape

To appreciate Stoelting's position, it helps to understand the competitive landscape of polygraph manufacturing. Lafayette Instrument Company, founded in 1947 by Max Wastl in Lafayette, Indiana [24]Verified Lafayette Instrument Co. Acquires Limestone Technologies
Confirms Lafayette Instrument acquired Limestone Technologies Inc. (Canada-based polygraph manufacturer) on August 12, 2022, is widely recognized as the world's leading manufacturer of polygraph instrumentation by market share [24]Verified Lafayette Instrument Co. Acquires Limestone Technologies
Confirms Lafayette Instrument acquired Limestone Technologies Inc. (Canada-based polygraph manufacturer) on August 12, 2022. Lafayette's current flagship is the LX series, and the company has expanded its portfolio through the acquisition of Limestone Technologies in August 2022 [25]Verified Converus — EyeDetect Technology
Confirms Converus is a separate company (not formerly Limestone Technologies) that makes the EyeDetect ocular-based credibility assessment system. Limestone Technologies is a Canada-based polygraph manufacturer now operating as a subsidiary of Lafayette Instrument Company [25]Verified Converus — EyeDetect Technology
Confirms Converus is a separate company (not formerly Limestone Technologies) that makes the EyeDetect ocular-based credibility assessment system — not to be confused with Converus, which is a separate Utah-based company that makes the EyeDetect ocular-based credibility assessment system [26]Verified Improving the Quality of Sexual History Disclosure: Emphasis on a Polygraph Examination
Confirms polygraph group disclosed more deviant sexual behaviors than comparison group, supporting SHDE effectiveness.

Axciton Systems is another notable competitor, founded by Bruce White, who began researching computerized polygraph technology in 1988 and was the first person to independently develop a computerized polygraph instrument [16]Verified Stoelting Instruments — Polygraph Museum
Confirms Stoelting milestones: first polygraph 1935, electronic channels 1946, multifunction channels 1966, modular design 1977, computerized polygraph 1988, CPS 1992. For a complete comparison of the Axciton product line and our technical reviews of the LX7-S system and Rubicon system, see our dedicated manufacturer profiles.

What distinguishes Stoelting from its competitors is its extraordinary longevity (founded 1886 vs. Lafayette's 1947), its breadth across psychological assessment and neuroscience equipment, and its continuous record of polygraph innovation spanning nine decades. Stoelting's cross-divisional expertise in precision physiological measurement gives its polygraph instruments a unique engineering pedigree. For guidance on polygraph equipment warranty and support across all major manufacturers, see our comparison guide.

A Tradition of Innovation Spanning Three Centuries

Stoelting Company's 140-year journey from a modest Chicago laboratory supply shop to a multi-division scientific instrument manufacturer represents one of the most remarkable continuity stories in American scientific industry. The company has maintained an unbroken manufacturing tradition from the horse-and-buggy era through two world wars, the space age, and the digital revolution.

In polygraph science specifically, Stoelting's innovations have repeatedly set new standards. The Polyscribe (1974) demonstrated that electronic engineering could substantially improve psychophysiological data collection. The Ultrascribe (1978) introduced modular channel architecture. The CAPS system (1988) brought computerized polygraph into being. And the CPS Elite continues to push the boundaries with features like built-in touchscreen displays and 360-samples-per-second sensor resolution.

For polygraph examiners, the practical significance is clear: Stoelting instruments come backed by a depth of psychophysiological expertise, precision engineering tradition, and manufacturing quality that few competitors can match. Whether you are just entering the profession through a PEAK Interviewing Course or are a veteran examiner evaluating your next equipment investment, understanding Stoelting's history provides essential context for appreciating the instruments you use every day.

The polygraph field has evolved dramatically since those first kymograph-derived instruments of the 1930s. Research continues to validate and refine polygraph methodology — from Synnott et al.'s comprehensive review of polygraph history and methodology [11]Verified Lie Detection: Its History, Methods and Techniques
Early comprehensive account of lie detection history documenting the transition from ancient ordeals to scientific instruments to modern studies examining the polygraph's effectiveness in specialized applications like sexual history disclosure [27]Verified Polygraph Examination of British Sexual Offenders: A Pilot Study
Early UK pilot demonstrating feasibility of SHDE polygraph testing with significant increases in sexual history disclosure [28]Verified The Sexual History Polygraph Examination and Its Influences on Recidivism
Found recidivists underwent fewer polygraph examinations on average, supporting polygraph's role in monitoring and post-conviction monitoring [29]Verified Sexual History Disclosure Polygraph Outcomes: Do Juvenile and Adult Sex Offenders Differ?
Found both juvenile and adult groups disclosed significantly more victims and offense types during polygraph-assisted interviews [30]Verified Employee Polygraph Protection Act: 20 Years Later
Analysis of the 1988 EPPA's impact, confirming maintained exceptions for government, security, and pharmaceutical industries. Stoelting's instruments have been at the center of this evolution for nearly a century, and the company shows every sign of continuing to lead for decades to come. For those who want to understand the question from the other side, our guide on whether you can beat a polygraph provides expert analysis.