Digital Psychrometer


Digital Psychrometer

The #SAM990DW Digital Psychrometer has the accuracy to monitor the four key environmental specs—ambient temperature, relative humidity, and dew point and wet bulb temperatures—in a wide range of professional, laboratory and industrial applications.


Best For:



  • Min/max memory + data hold
  • Dual readout LCD, with RH above temperature
  • °F/°C switch
  • Auto power off
  • NIST calibration is available
  • Specifications


    • Temperature measurement range/accuracy/resolution: -4° to 122°F (-20° to 50°C)/±1.8°F (±1°C)/0.1°
    • Humidity measurement range/resolution: 0 to 100%RH/0.1%
    • Humidity measurement accuracy: ±3% of reading from 10 to 90%RH; ±4% elsewhere in range
    • Dew point measurement range/accuracy: -47° to 122°F/±1.2°F (±0.6°C)
    • Response time: 60 seconds (typical)
    • Readout sizes: 3/8 in. high digits on upper readout; 3/16 in. high digits on lower readout
    • Auto power off: 20 minutes of inactivity
    • Weight: 2.65 oz. (75g)
    • Power source: Two "AAA" batteries (included)


    • Batteries
    • Protective cap with pocket clip
    • 1-year limited warranty


    • 6.7 x 1.93 x 0.65 in. (170 x 49 x 16.5mm)


    What is Dew Point?

    In simple terms, the dew point (dew point temperature or dewpoint) is the temperature at which a given concentration of water vapor in air will form dew. More specifically it is a measure of atmospher...
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    What is Wet Bulb?

    The wet-bulb temperature is the temperature a parcel of air would have if it were cooled to saturation (100% relative humidity) by the evaporation of water into it, with the latent heat being supplied...
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    What is a psychrometer?

    A psychrometer is an instrument that measures both the wet bulb and dry bulb temperatures.

    Prop 65

    ⚠ WARNING: This product can expose you to chemicals including di2-ethylhexylphthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to