Founded 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.
ISO AS9100D
ISO/IEC 17025 Accreditation
ISO 9001 Certification
ANSI/NCSL Z540
Compliance program
AMS 2750 Compliant
Compliance program
NIST-Traceable Calibration
Compliance program
ISO17025
Quality certification
GeoCorpSince 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.HURON, 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
Thermo Electric Company, IncSince 1941, Thermo Electric Company has built its reputation as a temperature-measurement specialist for industries where dependable readings matter. The West Chester-based manufacturer is now part of the COTEMP Sensing Group, with a network spanning six countries and three continents and a particular focus on tailored solutions for demanding industrial and semiconductor applications. Its work is supported by certified quality and calibration programs.WEST CHESTER, PA