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Extech RH300 Hygro Thermometer Psychrometer

£85.26 £71.05
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Extech's RH300 is used to carry out measurements of %RH, air temperature, dew point, wet bulb and probe temperature and can display results simultaneously on its LCD screen.

The tester can measure humidity from 10 to 90%RH, internal temperature from -4 to 122°F (-20 to 50°C), temperature (external) from -4 to 158°F (-20 to 70°C), dew point from -90.4 to 122°F (-68.0 to 49.9°C) and wet bulb from -6.9 to 122°F (-21.6 to 49.9°C).  Via the use of external probe (not included) the RH300 can also be used to calculate T1-T2 differential (air temperature minus external probe temperature) and T2-dew point.

To carry out measurements the RH300 uses a unique sensor that includes a twist cap, allowing the sensor to be protected during transportation and storage. The unit also contains a few extra functions such as switchable Celsius/Fahrenheit measurements, data hold and MAX/MIN readings.

A kit version of this product also exists. The RH305 includes the RH300, a temperature probe, calibration solutions and a carry case. To view more information about this item click the link to your left.

Extech RH300 Hygro Thermometer Psychrometer Key Features

  • 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 and T2-dew point
  • Unique sensor cap design twists to closed position for protection during storage
  • Switchable °F/°C temperature units with 0.1°
  • Data hold freezes current reading on display
  • MAX/MIN readings

Full List of Products Included

  • Extech RH300 Hygro Thermometer Psychrometer
  • 2 x AAA Batteries
Accessories related to this product:
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  2. extech rh300 cal humidity calibration kit
    Extech RH300 CAL Humidity Calibration Kit
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Part CodeRH300

Extech RH300 Technical Specifications

Specifications Range Max Resolution Basic Accuracy
Humidity 10 to 90% RH 0.1%RH ±3%RH
Temperature (Internal) -4 to 122°F (-20 to 50°C) 0.1° ±1°F or ±0.6°C
Temperature (External) -4 to 158°F (-20 to 70°C) 0.1° ±1°F or ±0.6°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)
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