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Additel Corporation designs and manufactures pressure and temperature calibration instruments — handheld calibrators, digital gauges, automated pressure controllers, dry-wells, and related modules used in shops and in the field.

Crystal Engineering (part of AMETEK Sensors, Test & Calibration) builds rugged, field-proven digital test gauges and calibration tools used by technicians who need portable accuracy under real plant conditions.

JOFRA (AMETEK Sensors, Test & Calibration) is a leading line of temperature calibration instruments — dry-block calibrators, reference equipment, and related tools used by industrial and metrology teams worldwide.

Mansfield & Green (AMETEK Sensors, Test & Calibration) is known for deadweight / piston gauges used as primary pressure standards in calibration labs. These instruments generate pressure from known masses and a characterized piston-cylinder, which is the reference many industrial labs use when TUR or uncertainty demands it.

Practical Instrument Electronics (PIE) manufactures handheld process calibrators for milliamp, thermocouple, RTD, voltage, frequency, and multifunction work. PIE calibrators are designed to be compact and straightforward to set up, with patented loop diagnostic tools (including LoopScope, RTD Autodetect, and TC FaultSense). Instruments are designed, assembled, and calibrated in the U.S., and ship with a Certificate of Calibration and a standard multi-year warranty.

For over five decades, Ralston Instruments has set practical standards for pressure calibration hardware — Quick-test hoses and fittings, hand pumps, and field gauges built for fast, leak-tight connections.

REED Instruments (since 2004) makes portable precision test and measurement instruments used by industrial maintenance teams, quality control departments, HVAC/R contractors, electricians, and health & safety professionals. The line covers electrical test, environmental meters, infrared thermometers, thermal imagers, and related accessories — with manufacturer warranty support and repair/calibration labs.