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Extech/Flir RH490 Precision Hygro-Thermometer

Highest 2% RH accuracy with Grains Per Pound (GPP) Display.

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Extech/Flir RH490 Precision Hygro-Thermometer
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  • Extech/Flir RH490 Precision Hygro-Thermometer

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    Item #2502

Anyone whose job relies on calculating humidity levels will appreciate the Extech Hygro-Psychrometer. In addition to measuring relative humidity in 30 seconds, this handheld instrument captures dew point, wet bulb, temperature and water vapor levels (Grams per Kilogram and Grains per Pound). This utility tool will store maximum and minimum readings until the memory is cleared and includes a data-hold button for rapidly fluctuating measurements. Complete with carrying case and 9V battery.

Highest 2% RH accuracy with Grains Per Pound (GPP) Display


  • Less then 30 seconds of RH response time
  • Water vapor in GPP
  • Dual backlit display
  • Simultaneous display of: Humidity/Temperature, Humidity/Dew Point or Humidity/Wet Bulb
  • Slim design with rubberized side grips
  • Data Hold and Min/Max functions
Humidity0 to 100%RH
Temperature (Internal)-22 to 199°F (-30 to 100°C)
Basic Accuracy±2%RH, ±1.8°F/1°C
Max. Resolution0.1%RH, 0.1°F/°C
Dewpoint-22 to 199°F (-30 to 100°C)
Wet Bulb32 to 176 °F (0 to 80°C)
Absolute Humidity0 to 1120GPP (0 to 160g/kg)
Dimensions7.8x1.7x1.3" (200x45x33mm)
Weight7oz (200g)