DewMaster Chilled Mirror Hygrometer

Edgetech Instruments field-proven chilled mirror technology.


  • A robust hygrometer for laboratory and industrial applications with field proven reliability and precision
  • Drift free primary method chilled mirror sensors have wide measurement ranges and do not require periodic recalibration
  • ISO/IEC 17025 accredited NIST traceable certification
  • Best in class air cooled temperature depression simplifies operation
  • Automatic Balance Control corrects for contaminants to maintain accuracy
  • Multiple sensor configurations available to fit various applications
  • Desk top, rack mount and NEMA 4X enclosure options available
RH-CAL Portable Humidity Calibrator Application Note

RH CAL Portable Relative Humidity Calibrator

The RH CAL is a programmable humidity calibration system that is at home in the metrology lab or in the field, performing on-site, NIST traceable humidity calibrations. The system provides very high accuracy for both relative humidity and temperature. Unlike other calibration systems, the RH CAL does not need compressed air or a water connection to operate, which allows the …


  • Based on Edgetech Instruments field proven chilled mirror sensor technology
  • A completely self-sufficient and portable humidity calibration system
  • Temperature and relative humidity controlled independently for custom humidity generation
  • High accuracy relative humidity and temperature control
  • Automatic correction for sensor mirror contaminants
  • Certified against NIST traceable standards in an ISO/IEC 17025 accredited laboratory

DewTech 390 Low Dewpoint Hygrometer

The Edgetech Instruments DewTech 390 is a precision dew/frost point hygrometer that measures extremely low frost points or trace moisture in a variety of background gases. Based on the primary method chilled mirror sensor technique, it is delivered with a NIST traceable calibration certificate and is certified in an ISO/IEC 17025 accredited calibration laboratory. At the core of the DewTech …


  • A precision laboratory grade hygrometer system that measures an extremely wide range of dew/frost points in gases from as low as –90°C frost point to as high as +20°C dew point
  • Based in the primary method chilled mirror technique with all the attributes, features and certifications needed for laboratory use at an affordable price
  • Ideal for metrology labs, scientific research and process measurements or any application where high precision measurement of dew/frost point over a wide range with fast response and high stability are required
  • For peak efficiency the sensor’s performance is maximized by an integral cryo-cooling system
  • The DewTech 390 is supported in the USA in a modern, ISO 9001 registered facility with ISO/IEC 17025 accredited calibration laboratory and is delivered with a UKAS traceability certificate.