Extech Hygro-Thermometer Psychrometer Kit - RH305

In stock

The hygro-thermometer psychrometer kit provides measurements of humidity, temperature and dew point and has the ability to calculate differential temperatures. Comes with external probe.

Extech Hygro-Thermometer Psychrometer Kit - RH305

Displays % relative humidity, temperature and dew point or wet bulb, probe temperature


  • Calculates T1-T2 differential (Air temperature minus External Probe temperature using TP890 probe) and T2-Dew Point
  • Simultaneous display of %RH, Temperature and Dew Point or Wet Bulb or Probe temperature
  • Unique sensor cap design twists to closed position for protection during storage
  • Switchable °F/°C temperature units with 0.1° resolution
  • Auto power off to save battery life
  • Wet bulb measurements without slinging
  • Data Hold and Auto Power off
  • Max/Min readings
  • This kit includes:
    • RH300 Meter
    • TP890 external temperature probe
    • RH300-CAL calibration bottles
    • Carrying case
  • 1 year warranty

This hygro-thermometer psychrometer is a highly accurate way to measure temperature, relative humidity and the dew point. With an included external probe for additional temperature measurements and the ability to compare and provide differential measurements. This meter also has wet bulb measurements to help determine the relative humidity and dew point. This kit has everything needed to start testing immediately.

Applications for this meter include monitoring temperature and humidity in greenhouses, warehouses, saunas, museums, storage areas and regular houses. Humidity is very important for living spaces due to its ability to cause skin damage when too low and promote mildew or dust mite growth when too high. The RH305 Hygro-Thermometer Psychrometer Kit User Manual is attached to this page to answer any further questions.


  • Humidity Range: 10 to 90%RH
  • Humidity Resolution: 0.1%RH
  • Temperature (internal): -4 to 122°F (-20 to 50°C)
  • Temperature (internal) resolution: 0.1°
  • Temperature (external): -4 to 158°F (-20 to 70°C
  • Temperature (external) resolution: 0.1°
  • 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)

Unit Ship Weight: 1.5 lbs

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