Seiler Instrument & Mfg. Co.
American manufacturer and distributor of precision optical, surveying, medical, geospatial, and planetarium equipment.
Last updated November 4, 2026
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Overview
Seiler Instrument & Mfg. Co. is a privately held American instrument company headquartered in the St. Louis metropolitan area, with its principal facility in Kirkwood, Missouri. Founded in 1945 by Eric H. Seiler and Dora L. Seiler, the company began as an optical repair business serving users of surveying instruments. It later developed into a diversified manufacturer, distributor, service provider, and systems integrator operating across military optics, surveying and geospatial technology, medical microscopy, engineering software, unmanned aerial systems, and planetarium equipment. The company’s origins are closely connected to European optical engineering. Eric Seiler received training in optical design and construction through the Zeiss Jena school of fine optics in Germany. After emigrating to the United States, he worked in the optical industry, including at the David White Company in Wisconsin, before establishing his own business at 922 Pine Street in St. Louis. The original repair-oriented operation gradually expanded from maintaining existing instruments into designing, manufacturing, refurbishing, distributing, and supporting specialized optical systems. Seiler’s Manufacturing Division is best known for precision optical fire-control equipment. The company manufactures optical assemblies and components used in artillery and mortar systems, including panoramic telescopes and related military instruments. Its capabilities cover machining, assembly, alignment, testing, and refurbishment. By repairing and rebuilding existing equipment, the division also supports the service life of military weapon systems. The company has described itself as the original equipment manufacturer of optical fire-control equipment used on United States howitzer and mortar systems, as well as on systems operated in other countries. The Geospatial-Survey Division serves surveying, transportation, utilities, engineering, mapping, geographic information systems, and related technical markets. Its activities include equipment sales, rentals, training, implementation, technical support, calibration, and repairs. Seiler has operated sales and service locations across the Midwestern United States and has maintained relationships with major technology suppliers, including Trimble and Autodesk. Its service footprint has included offices and authorized repair capabilities in states such as Missouri, Indiana, Wisconsin, Iowa, Illinois, Kentucky, Michigan, and Nebraska. The company’s software and engineering activities are organized in part through Seiler Design Solutions, LLC. This business provides architecture, engineering, and construction software, implementation services, training, and technical support. It has worked with Autodesk and Bluebeam products. The related GeoDrones segment supplies customized unmanned aerial systems for geospatial applications including agriculture, forensic work, inspection, mapping, surveying, mining, construction, and public safety. Seiler also operates in medical optics. Its Medical Division dates to 1950, when the company entered into an arrangement involving Carl Zeiss Jena microscope products for the North American market. Although that distribution relationship later ended, Seiler continued developing and supplying microscope products and services. Its medical and dental portfolio includes colposcopes, ear, nose and throat systems, audiology equipment, laboratory and compound microscopes, surgical microscopes, dental microscopes, surgical loupes, loupe lighting, and dental stools. Another long-running activity is the planetarium business. Seiler and Carl Zeiss reconnected through the planetarium sector in 1987, after which Seiler created its Planetarium Division. Seiler serves as the primary United States and Canadian sales, service, and repair contact for Carl Zeiss planetariums. The division supports projection systems used for education, scientific simulation, public interpretation, and entertainment, and has been associated with installations and service work at science museums and planetariums. In 2009, Seiler consolidated its corporate headquarters and several operating divisions into a roughly 148,000-square-foot facility in the Tree Court Industrial Park in Kirkwood. The move brought manufacturing, surveying, and microscope operations together and reflected the company’s multi-division structure. In 2010, the company disclosed that certain parts had been improperly certified as compliant with the Buy American Act. A later federal pretrial diversion agreement required a $1.5 million forfeiture and a compliance program monitored by the U.S. Department of Defense. Seiler subsequently continued pursuing government and commercial work. In 2021, it received a military contract with a maximum value of $23,475,982 for panoramic telescopes for M119A1 light towed howitzers. In 2022, it acquired the assets of Precision Midwest, expanding its Trimble Geospatial distribution and service territory in Iowa, northern Illinois, and specified counties in northwestern Indiana.
History
Seiler Instrument & Mfg. Co. was established in 1945 in St. Louis by Eric H. Seiler and Dora L. Seiler. Eric Seiler brought formal expertise in optical design and construction from the Zeiss Jena school of fine optics in Germany. Following his immigration to the United States, he continued working in optics, including employment with the David White Company in Wisconsin. The new company initially operated from 922 Pine Street and concentrated on repairing surveying instruments already in use. Over the following decades, Seiler expanded beyond repair into optical design, manufacturing, refurbishment, distribution, training, and technical service. Its defense manufacturing business became a central part of the company. The Manufacturing Division produces and tests precision optical fire-control assemblies and components for military artillery and mortar systems. It also refurbishes older fire-control equipment, allowing customers to maintain existing weapon platforms rather than replacing complete systems. The company entered medical optics in 1950 through an arrangement to distribute Carl Zeiss Jena microscopes in North America. After the distribution relationship ended, Seiler continued in medical and dental microscopy, developing and supplying products for surgical, laboratory, ophthalmic-adjacent, dental, otolaryngological, audiological, and related applications. Its product and service activities include medical microscopes, dental microscopes, colposcopes, ENT systems, surgical loupes, lights, and accessories. Seiler’s surveying and geospatial business developed into a broad distribution and services operation. The division supports surveying, transportation, utilities, engineering, GIS, GPS, mapping, and other infrastructure-related fields. Rather than limiting itself to equipment sales, Seiler provides rentals, training, implementation, repairs, technical support, and service-center functions. Its supplier relationships have included Trimble for geospatial products and Autodesk for design and engineering software. In 1987, Seiler and Carl Zeiss reconnected in the planetarium sector. Seiler established a Planetarium Division and became the principal United States and Canadian contact for Carl Zeiss planetarium sales, servicing, and repairs. The division has supported systems used in museums, science centers, and educational planetariums, including large installed bases of Zeiss projectors around the world. In 2009, Seiler consolidated its headquarters and several divisions in a new facility at Tree Court Industrial Park in Kirkwood, Missouri. The approximately 148,000-square-foot site brought together corporate functions, manufacturing, surveying, and microscope operations. The consolidation reflected the company’s strategy of maintaining several specialized businesses under one organization while sharing technical, operational, and service capabilities. The company faced a federal compliance matter involving Buy American Act certifications. In 2010, Seiler acknowledged that some parts had been improperly certified. The matter later resulted in a pretrial diversion agreement requiring a $1.5 million forfeiture and a compliance program monitored by the Department of Defense. This remains the principal publicly documented regulatory controversy associated with the company. Seiler continued its defense and industrial work after the compliance matter. In 2021, it received a maximum $23,475,982 indefinite-delivery/indefinite-quantity contract for panoramic telescopes for M119A1 light towed howitzers. In 2022, it expanded its geospatial distribution business by acquiring the assets of Precision Midwest, extending Trimble Geospatial coverage across Iowa, northern Illinois, and parts of northwestern Indiana. Today, Seiler is organized around manufacturing, geospatial surveying, medical optics, design and construction software, geospatial drones, and planetarium systems. Its business model combines original equipment manufacturing with third-party distribution, system integration, field service, repair, refurbishment, training, and long-term technical support.
- 2022
Precision Midwest assets acquired
The company acquired Precision Midwest assets to expand Trimble Geospatial distribution and support in Iowa, northern Illinois, and parts of northwestern Indiana.
- 2021
M119A1 panoramic telescope contract awarded
Seiler received a maximum $23,475,982 indefinite-delivery/indefinite-quantity contract for panoramic telescopes for M119A1 light towed howitzers.
- 2010
Buy American Act compliance issue identified
[2]The company acknowledged that some parts had been improperly certified under the Buy American Act, leading to a later federal compliance agreement.
- 2009
Operations consolidated in Kirkwood
[1]Corporate headquarters and manufacturing, surveying, and microscope operations moved into a single large facility in Tree Court Industrial Park in Kirkwood, Missouri.
- 1987
Planetarium division created
[1]Seiler and Carl Zeiss re-established a commercial relationship through the planetarium business, with Seiler becoming the North American sales and service contact for Zeiss planetariums.
- 1950
Medical microscope activity established
[1]Seiler entered the medical optics field through an arrangement to distribute Carl Zeiss Jena microscopes in North America.
- 1945
Company founded in St. Louis
[1]Eric H. Seiler and Dora L. Seiler founded the company as an optical business initially focused on repairing surveying instruments.
Products and positioning
A specialized, technically oriented instrument company combining defense optical manufacturing with Midwestern geospatial distribution, medical microscopy, software integration, drone services, and planetarium support.
Defense optics
Military optical fire-control systems
Seiler manufactures precision optical assemblies and components for artillery and mortar fire-control applications. The work includes machining, assembly, alignment, testing, and refurbishment. The company supports optical equipment used on United States howitzer and mortar systems and on military systems operated internationally.
Surveying and geospatial technology
Surveying and geospatial solutions
The Geospatial-Survey Division supplies surveying, mapping, GIS, GPS, transportation, utility, and engineering equipment. Its offering extends beyond distribution to rentals, implementation, training, repairs, technical support, and authorized service work for professional users.
Medical optics
Medical and dental microscopes
Seiler supplies optical systems for medical, dental, laboratory, and surgical settings. The portfolio includes colposcopes, ENT and audiology systems, compound and laboratory microscopes, multidisciplinary surgical microscopes, dental microscopes, surgical loupes, loupe lights, and dental stools.
Planetarium equipment · 1987
Carl Zeiss planetarium systems
Through its Planetarium Division, Seiler serves as a sales, service, and repair contact for Carl Zeiss planetarium systems in the United States and Canada. These systems support simulation, science education, public interpretation, and entertainment in museums and planetariums.
Unmanned aerial systems
Geospatial drones
The GeoDrones business provides customized drone solutions for mapping and surveying, agriculture, inspections, forensics, mining, construction, and public safety. The offering is positioned around geospatial data collection and integration with professional workflows.
Engineering software and services
Design and construction software services
Seiler Design Solutions provides architecture, engineering, and construction software together with sales assistance, implementation, training, and technical support. Its documented partner relationships include Autodesk and Bluebeam.
Controversies
2017
Buy American Act certification matter
A federal pretrial diversion agreement followed the company’s admission that certain parts had been improperly certified as compliant with the Buy American Act. Seiler agreed to pay a $1.5 million forfeiture and participate in a Department of Defense-monitored compliance program.
Brand decisions
2022
Acquisition of Precision Midwest assetsM&ABackground
Seiler sought to expand its Trimble Geospatial distribution and service territory in the Upper Midwest.
Action taken
The company acquired Precision Midwest assets covering Iowa, northern Illinois, and specified counties in northwestern Indiana.
Aftermath
The transaction broadened Seiler’s regional geospatial sales and support coverage.
2009
Consolidation of major divisions in KirkwoodStrategyBackground
Seiler operated across several specialized activities, including manufacturing, surveying, and microscopy.
Action taken
The company moved headquarters and multiple divisions into a single approximately 148,000-square-foot facility in Tree Court Industrial Park.
Aftermath
The relocation placed several technical and commercial functions together while preserving the company’s multi-division operating model.
Recent events
- 2022
Seiler Instrument acquired Precision Midwest assets
M&A
Seiler acquired the assets of Precision Midwest to provide Trimble Geospatial products and related support in Iowa, northern Illinois, and specified northwestern Indiana counties.
- 2021
Seiler Instrument received a military contract for M119A1 panoramic telescopes
Other · Product launch
The company was awarded a maximum-value indefinite-delivery/indefinite-quantity contract for panoramic telescopes used with M119A1 light towed howitzers. The reported maximum contract value was $23,475,982.
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