SAM990DW - Accurate Digital Psychrometer

  • $89.89 USD
Shipping calculated at checkout.

Only 12 left!

The General Tools 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.  

The Dew Point (DP) temperature is the temperature below which the water vapor in a volume of air at a given constant barometric pressure will condense into liquid water at the same rate at which it evaporates. Condensed water is called dew when it forms on a solid surface. The Wet Bulb (WB) temperature is the temperature that a volume of air would have if it were cooled to saturation (100% RH) by the evaporation of water into it, with the latent heat coming from the volume of air. The WB temperature is the temperature you feel when your skin is wet and exposed to moving air as opposed to the actual air temperature—the dry bulb temperature.

The large digital display shows Relative Humidity (RH) as a percentage + ambient, Dew Point (DP) and Wet Bulb (WB) temperatures in °C or °F. The digital tool has many built in features including min/max memory with reset key, min/max memory + data hold, auto off and a low battery indication. It’s easy to use with no twirling or charts necessary. Included with the tool is a protective cap with pocket clip, user manual and 2 AAA batteries.


  • Temperature
  • Dew point
  • Humidity
  • Wet and dry bulb
  • Min/Max memory
  • Auto power off
  • F/C switch
  • Data hold
  • Protective cap with pocket clip
    • Temperature range: -4 °F to 122 °F (-20 °C to 50 °C)
    • Humidity range: 0 to 100% RH
    • Temperature accuracy: ±1.8 °F( ±1 °C)
    • Humidity accuracy: ±5%
    • Wet bulb readings in 5 seconds
    • Electronic capacitive sensor with microprocessor

    Supplied With:

    • Batteries
    • Protective cap with pocket clip

    Customer Reviews

    No reviews yet

    Net Orders Checkout

    Item Price Qty Total
    Subtotal $0.00 USD

    Shipping address

    ★ Reviews

    Let customers speak for us

    420 reviews
    La Crosse Technology
    La Crosse Wireless Temperature Sensor
    Great service
    Good product, but