• IR Thermometer Range: -58 to 932°F (-50 to 500°C)
  • IR Thermometer Accuracy: ±2% or ±4°F/2°C
  • Distance to Target Ratio: 30:1
  • Type K Temperature Range: -148 to 2501°F (-100 to 1372°C)
  • Type K Temperature Accuracy: ±(1% + 1°C)
  • RH Range: 0 to 100%
  • RH Accuracy: ±2%RH
  • Dew Point Range: -90.4 to 140°F (-68 to 60°C)
  • Wet Bulb Range: -6.88 to 140°F (-21.6 to 60°C)
  • USB computer interface and software included

What's in the Box

  • Windows compatible software
  • USB cable
  • Type K bead wire temperature probe
  • Built-in stand
  • 9V battery
  • Hard carrying case


The Extech HD500 Psychrometer with IR Thermometer is a versatile 3-in-1 instrument that combines the functions of humidity meters, Type K thermometers, and non-contact infrared thermometers. These functions, combined into a rugged handheld housing, makes the Extech HD500 a great tool for home inspection applications.

Extech HD500 psychrometers are capable of a number of temperature/humidity measurements. The built-in infrared thermometer is for non-contact surface temperature measurements to 932°F (500°C). The infrared thermometer has a 30:1 distance to target ratio. The type K temperature function utilizes a type K probe for contact measurements up to 2501°F (1372°C). The HD500 also measures relative humidity with a range of 0 to 100%. Dew point and wet bulb measurements are also possible.

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