Extech RH490 Precision Thermo-Hygrometer

  • $364.99

The Extech RH490 not only measures relative humidity in 30 seconds, the 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.

  • Less Than 30 Second RH Response Time
  • Water Vapor in GPP (g/kg)
  • Dual Backlit Display
  • Simultaneous Display of: Humidity or GPP (g/kg) plus Temperature, or Humidity or GPP (g/kg) plus Dew Point, or Humidity or GPP (g/kg) plus Wet Bulb.
  • Slim Design with rubberized sides for better grip and for one hand operation


  • 1 - Carrying Case
  • 1 - 9V Battery