Extech RH300 Psychrometer

Extech RH300 Hygro-Thermometer Psychrometer

Humidity, Wet bulb, Dew Point, Air Temperature plus External Probe Temperature measurements

The Extech RH300 is a compact meter that is ideal for field applications. Simultaneously displays relative humidity (10% to 90% RH), air temperature and dew point or wet bulb.

Calculates T1-T2 differential (air temperature minus external probe temperature) using optional probe (TP890), and T2 minus dew point.

Built-in protective sensor cap. Other features include Data Hold, Auto Power Off, and MAX/MIN reading. Complete with 2 AAA batteries.

    Extech RH390 Datasheet

    Extech RH300 User Manual

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    The Extech RH300 Hygro-Thermometer Psychrometer is well-suited for field applications.

    Its unique sensor cap closes for protection during storage.Simultaneously displays relative humidity, air temperature and dew point or wet bulb. Calculates T1-T2 differential (air temperature minus external probe temperature) using optional probe (TP890), and T2 minus dew point.

    Other features of the RH300 include Data Hold, Auto Power Off, and MAX/MIN reading.

    Extech RH300 Hygro-Thermometer 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-External Probe Temperature) using optional probe
    • Unique sensor cap design twists to closed position for protection during storage
    • Switchable °F/°C temperature units with 0.1° resolution

    Extech RH300 Sensor Protective Cap

    Turn the protective cap (top of meter), in the direction of the OPEN arrow to allow air into the sensor cavity.

    Turn the cap in the direction of the CLOSE arrow to protect the sensors.

    Always open the cap to take measurements and close when storing.

    Extech RH300 Specifications:

    Specifications Ranges Max Resolution Basic Accuracy
    Humidity 10 to 90%RH 0.1%RH ±3%RH
    Temperature (internal) -20 to 50°C 0.1° ±1°C
    Temperature (external) -20 to 70°C 0.1° ±1°C
    Dew Point -68.0 to 49.9°C
    Wet Bulb -21.6 to 49.9°C
    Dimensions 178.5 x 48.4 x 24.7mm
    Weight 95g

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