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Crystal Engineering Corporation

• Pressure calibrators
• Digital pressure gauges
• Pressure comparators
• Calibration software

Heise Precision Pressure Instruments

• Pressure standards
• Portable pressure calibrators
• Pressure volume controller
• Bench top/panel mount digital pressure indicators and mechanical gauges
• Dial gauges

Ralston Instruments

• Portable pneumatic high pressure sources
  
• Pressure calibration pumps, manifolds, hose and fittings
  
• Pressure volume controllers

Rotronic Instrument Corporation

• Relative humidity and dew point instruments, probes, indicators and transmitters
• Humidity calibrators
• Humidity chambers
• Water activity measurement systems

ThermoProbe Inc.

• Portable precision RTD thermometers