- Caldwell Systems Corporation
- Offers leak detection and tank monitoring equipment.
- Cincinnati Test Systems, Inc.
- Design and manufacturing of leak test and assembly verification solutions.
- Dart Sensors Ltd
- Manufactures and supplies breath alcohol sensors, alcohol, carbon monoxide, formaldehyde, and air quality sensors, certified reference standards for alcohol sensor calibration.
- The Electron Machine Corporation
- Manufactures refractometers, x-ray thickness gages and other process analyzers.
- Industrial Monitor and Control Corporation
- Designs and develops fourier transform infrared gas monitoring equipment for detecting chemical compounds in industrial environments.
- MAC Instruments
- Manufactures high temperature (up to 2400 deg f ) humidity and dew point analyzers, as well as steam flow meters and transmitters.
- Madur
- Manufacturer of flue gas analyzers, landfill analyzers and infrared sensors for industrial and OEM applications.
- MKS Instruments
- Source of instruments, components, and subsystems, for vacuum and gas-based processes.
- New England Photoconductor
- Lead sulfide, lead selenide, and ingaas detectors, linear multiplexed arrays, custom detectors, packaging, and electronics.
- Nova Analytical Systems Inc.
- Manufacturer of gas and water analysis equipment for industry.
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