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Grains Per Pound Precision Hygro-Thermometer

Product Announcement from Flir Commercial Systems

Grains Per Pound Precision Hygro-Thermometer-Image

New Precision Hygro-Thermometer with Direct Digital Display of Grains per Pound (GPP), Model RH490. Ideal for structural drying and water damage restoration, HVAC/R, plant maintenance, mold inspection and remediation, Extech's RH490 features 2% RH accuracy with a RH response time of less than 30 seconds. Learn more about Extech Instruments.


  • Less than 30 second RH response time
  • Water vapor in GPP
  • Dual backlit display
  • Simultaneous display of:
    - Humidity or GPP plus Temperature
    - Humidity or GPP plus Dew Point
    - Humidity or GPP plus Wet Bulb
  • Slim design with rubberized sides for better grip and for one hand operation
  • Data Hold and Min/Max functions
  • Auto power off with disable and low battery indicator
  • Complete with carrying case and 9V battery