Since 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.
ISO 9001:2015
certification
ISO 17025:2017
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IECEx QAR Quality System Assessment Report
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ATEX Quality Assurance Notification
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UK Quality Assurance Notification
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PED Declaration of Conformity
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REACH Declaration of Conformity
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RoHS Certificate of Compliance
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EU No 833/2014 Certificate of Compliance
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EU No 2023/956 Carbon Border Adjustment Mechanism Certificate of Conformity
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US TSCA Restriction on PIP 3:1 Certificate of Compliance
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Persistent Organic Pollutants Declaration of Conformity
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PFAS Declaration of Conformity
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California Proposition 65 Declaration
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Trade Agreement Acts Certificate of Compliance
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FieldLab IECEx Certificate of Conformity
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FieldLab ETL Authorization to Mark
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Field Gauge ETL Authorization to Mark
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Field Gauge IEC/IECEE CB Test Certificate
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Field Gauge Korea Broadcasting and Communication Equipment Registration
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United Instruments, IncSince 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.WESTBURY, NY
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
Kessler Thermometer and Chase InstrumentFamily-owned and operated since 1934, Kessler Thermometer and Chase Instrument manufactures precision thermometers and hydrometers in West Babylon, New York. The company is one of the last U.S. manufacturers in this field and developed its mercury-free SafetyBLUE line for applications where mercury is prohibited. Its 8,000-square-foot facility includes an ISO-accredited calibration laboratory that certifies instruments and provides NIST-traceable reports.WEST BABYLON, NY
Gage-It, IncSince 1991, Gage-It, Inc. has supplied pressure gauges and backflow test kits while repairing, calibrating, and certifying instruments in its in-house Sellersville shop. The company stands apart for specialized work on ITT Barton and Cameron liquid-level gauges, custom diaphragm-seal assemblies, and oxygen-service cleaning. Its calibration certificates are traceable to NIST, with pressure-gauge capability spanning from inches of water column to 60,000 psi.221320SELLERSVILLE, PA