Since its founding in 1997, United Instruments has built its identity around in-house engineering and calibration work for utility and industrial customers. Owner Mark Grigoraki brought the company the rights to manufacture the Precision Low Pressure Calibration System in 1998, and United Instruments still performs its manufacturing and calibration work in the USA for metrology labs and major corporations.
NIST Traceable Calibration
Ralston InstrumentsSince 1969, family-owned Ralston Instruments has built pressure and temperature calibration systems in Ohio, from portable test pumps to digital calibrators and connection hardware. Every product is designed, engineered, and manufactured in the United States, with in-house calibration supported by an ISO/IEC 17025:2017-accredited laboratory. Its Quick-test™ connection system is a distinctive Ralston innovation, enabling high-pressure calibration connections without wrenches or thread tape.NEWBURY, OH
IET Labs, IncFounded in 1976, IET Labs manufactures precision electrical test and measurement equipment, with a particular focus on metrology standards and meters for resistance, capacitance and inductance. The U.S. manufacturer also preserves the GenRad and esi instrument lines acquired in 2000 and 2006, while providing calibration and repair through its ISO-17025-accredited laboratory. IET says 98% of its products are manufactured in the United States.ROSLYN HEIGHTS, NY
TensitronTensitron has been an American instrument maker since 1935, when physicist Dr. Erwin J. Saxl founded the company’s predecessor to solve industrial tension-control problems. Now part of family-owned KTC Instruments, the Pittsburgh operation preserves that engineering heritage by making precision tension meters for manufacturers and maintenance teams worldwide. Its in-house ISO/IEC 17025:2017-accredited laboratory also calibrates the instruments it builds to NIST-traceable standards.PITTSBURGH, PA
Meriam Process TechnologiesStarted by Joseph Meriam with his wife and children as the workforce in a 1911 garage operation, Meriam Process Technologies manufactures pressure and flow measurement instrumentation along with test and calibration equipment. The company’s original U-tube manometers grew into a broad process-measurement business, including digital manometers and its MFC5150 HART communicator, which reads device descriptions without translations or subscriptions. Meriam is now a Western Enterprises company and remains part of the Scott Fetzer Company heritage described in its history.CLEVELAND, OH