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Extech RH300 Digital Psychrometer
RH300 Digital Psychrometer
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Our Price: $94.99

Availability:: Usually Ships in 24 to 48 Hours
Product Code: EXT-RH300

NIST Certificate (Adds 7-10 days):



  • Simultaneous display of %RH, Temperature and Dew point or Wet Bulb or Probe Temperature
  • Wet bulb measurements without slinging
  • Calculates T1-T2 differential (Air Temperature minus External Probe Temperature) using optional probe (TP890) and T-2 Dew Point
  • Unique sensor cap design twists to closed position for protection during storage
  • Switchable F/C temperature units with 0.1 resolution
  • Data Hold freezes current reading on display
  • Max/Min readings
  • Auto power off to save battery life
  • RH300 complete with 2 AAA batteries
  • Optional external temperature probe (TP890)

Optional Kit RH305 Includes:

  • RH300
  • Temperature probe
  • 33% and 75% calibration bottles
  • Carrying case

Specifications (Range, Max Resolution, Basic Accuracy):

  • Humidity: 10 to 90%RH, 0.1%RH, 3%RH
  • Temperature (internal): -4 to 122F (-20 to 50C), 0.1, 1F or 0.6C
  • Temperature (external): -4 to 158F (-20 to 70C), 0.1, 1F or 0.6C
  • Dew Point: -90.4 to 122F (-68.0 to 49.9C)
  • Wet Bulb: -6.9 to 122F (-21.6 to 49.9C)
  • Dimensions: 7x1.9x1" (178.5x48.4x24.7mm)
  • Weight: 3.3oz (95g)

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