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Sensor Type
Temperature / Freeze
Tool Type
Temperature Measurement
Infrared (IR)
LCD Display
Ease of Installation
Beginner (Installs < 10 minutes)
Extech Instruments
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Psychrometer Combines the Functions of a Humidity Meter, Type K Thermometer, and InfraRed Thermometer for Non-contact Surface Temperature Measurement
Extech Instruments HD500 Psychrometer with InfraRed Thermometer
Extech Instruments HD500 Psychrometer with InfraRed Thermometer
Extech Instruments HD500 Psychrometer with InfraRed Thermometer
Item# 90256
Price: Normally $269.99 
Hot Deal $227.70
Free shipping on orders over $50 - See Details


  • Built-in InfraRed Thermometer for non-contact temperature measurement to 932°F (500°C) with 30:1 distance to target ratio
  • Type K Temperature function for contact temperature measurement to 2501°F (1372°C)
  • Highest 2% RH accuracy
  • Heavy Duty rugged double molded housing with large triple LCD backlit display
  • Auto power off
  • USB Port

Essential Info

This handheld meter measures and displays Air Temperature, Relative Humidity, Dew Point, Wet Bulb and also Surface Temperature using the built-in IR thermometer. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.


What's Included

  • Windows® Compatible Software
  • USB Cable,
  • Type K Bead Wire Temperature Probe
  • Built-in Stand,
  • Hard Carrying Case
  • 9V Battery
  • More Info

    Patented non-contact InfraRed Thermometer technology built
    into a Hygro-Thermometer is perfect for Home inspection applications.


    InfraRed Thermometer: -58 to 932°F (-50 to 500°C)
    Distance to Target Ratio: 30:1
    Type K Temperature: -148 to 2501°F (-100 to 1372°C)
    Air Temperature: 14 to 140°F (-10 to 60°C)
    RH Range: 0 to 100%RH
    Dew Point: -90.4 to 140°F (-68 to 60°C)
    Wet Bulb: -6.88 to 140°F (-21.6 to 60°C)
    Dimensions: 10 x 2.9 x 2" (255 x 75 x 50mm)
    Weight: 12.3oz (350g)

    Important notes:
    Only defective exchanges for identical item within 30 days of purchase. No other returns allowed on this item. For defective returns after 30 days, please contact the manufacturer.
    Manufacturer contact information: Extech Instruments Corp, Tel: (781) 890-7440 Ext 200



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