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High Precision, Low Frost Point Hygrometer

Featured Product from Edgetech Instruments Inc.

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The DewTech 390 Precision Hygrometer offers low dew/frost point trace moisture measurements at a very attractive price. It is easy to install into standard cabinets or 19-inch rack systems.

At the core of the DewTech 390 is three-stage, Peltier cooled primary method chilled mirror sensor. For peak efficiency, the performance of the Peltier is maximized by an integral cryo-cooling refrigeration system.

Connections to the DewTech 390 are simplified. You need only to install power, user interface to outputs, and sample gas input/output connections. Turn the unit on and the DewTech 390 automatically goes through start-up and self-check procedures.

Ideal for metrology labs, scientific research and process measurements, standard configurations include benchtop or 19-inch rack mount.

The DewTech 390’s standard features include:

  • Primary method measurement technique traceable to NIST
  • Dew/frost point range of -90°C to +20°C
  • Accuracy of +0.1°C dew/frost point available
  • Front access sensor for easy cleaning and inspection
  • Moisture concentration measurement at atmospheric or elevated pressure
  • Can be configured to display temperature and pressure
  • Available with standard or chemical resistant, high performance sensor


Edgetech Instruments Inc. designs and manufacturers accurate and reliable absolute humidity hygrometers, relative humidity transmitters, humidity probes, moisture and dew/frost point analyzers, relative humidity calibrators, dew/frost point generators and oxygen measurement instrumentation. Edgetech Instruments products are manufactured, calibrated and serviced to the highest industry standards in a modern, ISO/IEC 17025:2017 accredited, ISO 9001:2015 registered facility located in Hudson, Massachusetts. All certifications and calibrations are traceable to NIST.