Founded 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.
ISO 9001:2015
ISO 17025:2017
NVLAP Accreditation, Lab Code 200512-0
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
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
H&H Machine Shop of Akron, IncFounded by Henry Haas and his son Richard in 1959, H&H Machine Shop of Akron makes precision-machined parts, assemblies, and industrial thermocouples from its Akron and Ravenna operations. The company has grown to more than 68,000 square feet, including a dedicated assembly area and a temperature-controlled inspection facility, while maintaining quality procedures that comply with MIL-1-45208 and MIL-STD-45662.AKRON, OH