Back to Products

DewTech 390 Low Dew Point Hygrometer

Product Description

The Edgetech Instruments Model DewTech 390 is a Precision Low Dew Point Hygrometer which offers measurement of extremely low Dew Point or Trace Moisture for a variety of background gases at a very attractive price. Based on the Primary Standard Chilled Mirror measurement technique, it provides absolute knowledge of dew point and is provided with a NIST traceable calibration certificate.

At the core of the DewTech 390 is a three stage, peltier cooled chilled mirror sensor. For peak efficiency, the performance of the peltier is maximized through an integral cryo-cooling refrigeration system. Ideal for metrology labs, scientific research and process measurements. Standard configurations include Benchtop or 19 inch Rack Mount.  The DewTech 390 features a user-friendly display panel, an EZ access sensor, multiple outputs and alarm capability.



  • Primary Standard Measurement Technique
  • Absolute Knowledge of Dew Point
  • Standard Accuracy is ±0.2°C DP
  • Easy, Front Access Sensor for easy cleaning and inspection
  • Display moisture concentration at atmospheric pressure or compensate for pressure variations
  • Can be configured to display Temperature or Pressure
  • Available with standard or chemical resistant sensor


  • Educational Institutions
  • Furnace
  • Government Agencies
  • Medical Gas
  • Metrology
  • Pharmaceuticals
  • Plastics
  • Power and Energy
  • Semiconductor
  • High Accuracy
  • R&D Test & Measurement
  • Vacuum Systems