Since 1989, GeoCorp has manufactured thermocouples and thermocouple wire in Huron, Ohio, supplying temperature-measurement products directly from its own operation. The company grew into wire production with the purchase of its first braider in 1999 and now operates more than 95 braiders. Its in-house quality-control laboratory is accredited to ISO/IEC 17025 by NVLAP, lab code 200496-0, and GeoCorp offers custom thermocouple configurations for demanding industrial applications.
ISO/IEC 17025:2017
certification
NVLAP Calibration Laboratory, Lab Code 200496-0
registration
AMS 2750 Rev. H
compliance_program
BAC 5621 L
compliance_program
Marlin Thermocouple Wire IncMarlin Thermocouple Wire is a Westlake, Ohio manufacturer built around technically oriented temperature-sensing products and in-house production. It serves industrial end users and distributors, with particular experience supporting demanding metalworking applications and maintaining a NIST-traceable calibration laboratory for reliable test results.WESTLAKE, OH
Cleveland Electric LaboratoriesFounded in 1920 as a repair service for railroad and Cleveland industries, family-owned Cleveland Electric Laboratories now makes custom high-temperature thermocouples and industrial sensors for demanding temperature, pressure, and strain measurements. Based in Twinsburg, the company also operates an ISO/IEC 17025-accredited calibration laboratory capable of certifying temperatures from -320°F to 2800°F. Its work spans built-to-order sensing solutions, turbine-engine instrumentation, and complex small-batch machining, with quality systems certified to ISO 9001 and AS9100D.TWINSBURG, OH
Thermtrol CorporationSince 1987, Thermtrol Corporation has engineered and manufactured wire and cable harnesses, thermal protectors, and custom electrical assemblies from its headquarters in North Canton, Ohio. Its 25,000-square-foot Ohio technical center works with a wholly owned 100,000-square-foot Vietnam manufacturing facility and Hong Kong support operation to serve customers worldwide. Thermtrol’s quality system has carried ISO 9001 certification since 2000, alongside ISO 14001 and IATF 16949 certifications.NORTH CANTON, OH
Marlin Manufacturing CorporationFounded in 1952 by John and Lillian Tymkewicz, Marlin Manufacturing Corporation grew from John’s work as a machinist and NACA innovator into a Cleveland company serving research and industrial customers. It is best known for the thermocouple connector developed from Tymkewicz’s early idea, and continues that temperature-instrumentation work with an ISO 9001:2015-registered quality system and an ISO 17025:2017-accredited metrology lab.CLEVELAND, OH