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Hygro-Thermometer Psychrometer

Article No. 13986

Hygro-Thermometer Psychrometer

The RH300 Hygro-Thermometer Psychrometer is used for Humidity, Wet bulb, Dew Point, Air Temperature and has an External Probe for Temperature measurements. It is a compact meter that is ideal for field use, and simultaneously displays relative humidity (10% to 90% RH), air temperature and dew point or wet bulb. 

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$127.00 excl. taxes & shipping cost


  • Simultaneous display of %RH, Temperature and Dew point or Wet Bulb or Probe Temperature
  • Wet bulb measurements without slinging
  • Built-In unique sensor cap design twists to closed position for protection during storage
  • Switchable °F/°C temperature units with 0.1° resolution
  • The RH300-CAL is a kit which contains 33% and 75% humidity calibration bottles. Used for verifying calibration of the 445815 humidity meter. Bottles have small opening designed to snuggly fit the remote sensor probe.
  • Calculates T1-T2 differential (air temperature minus external probe temperature) using optional probe (TP890), and T2 minus dew point

Technical Attributes

  • Data
    SpecificationsRangesMax ResolutionBasic Accuracy
    Humidity:10 to 90%RH0.1%RH±3%RH
    Temperature (internal):-4 to 122°F (-20 to 50°C)0.1°±1.8°F or ±1°C
    Temperature (external):-4 to 158°F (-20 to 70°C)0.1°±1.8°F or ±1°C
    Dew Point:-90.4 to 122°F (-68.0 to 49.9°C)
    Wet Bulb:-6.9 to 122°F (-21.6 to 49.9°C)
    Dimensions:7 x 1.9 x 1" (178.5 x 48.4 x 24.7mm)
    Weight:3.3oz (95g)


Thermisitor Temp Probe
RH300-CAL: Humidity Calibration Kit
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