Extech Heat Stress WBGT Meter – HT30

In stock

This Heat Stress WBGT Meter measures the total heat stress in an environment based on the effects of temperature, humidity and direct or radiant sunlight. Great for greenhouses and gardens.

Extech Heat Stress WBGT Meter – HT30

Wet Bulb Globe Temperature (WBGT) considers the effects of temperature, humidity and direct or radiant sunlight


  • Heat stress index measures how hot it feels when humidity is combined with temperature, air movement and radiant heat
  • Black Globe Temperature (TG) monitors the effects of direct solar radiation on an exposed surface
  • Air Temperature (TA) plus Relative Humidity (RH)
  • Selectable units of °F and °C
  • In/Out Function displays the WBGT value with or without direct sun exposure
  • Auto power off with override
  • Built-in RS-232 interface for downloading data to a PC
  • Comes complete with 2 AA batteries
  • 1 year warranty

This instrument uses wet bulb globe temperature to consider the effects of temperature, humidity and direct or radiant sunlight to get a reading of the actual heat stress created. This is a great meter for greenhouse monitoring and use in the field. When plants are overly heat stressed they start to dry up, produce less fruit and ultimately die.

Keeping track of the heat stress value on plants is invaluable to know when they really need watering or shading. This meter has the added ability to download data to a PC through the built-in RS-232 interface. The temperature range of the black globe is -32 to 176°F (0 to 80°C) to incorporate every growing condition possible. The HT30 Heat Stress WBGT Meter User Manual is attached to this page to answer any further questions.


  • Wet Bulb Globe Temperature (WBGT): 32 to 122°F (0 to 50°C)
  • Black Globe Temperature (TG): 32 to 176°F (0 to 80°C)
  • Air Temperature: (TA) 32 to 122°ºF (0 to 50ºC)
  • Humidity: 0 to 100%RH
  • Dimensions:
    • Meter: 10 x 1.9 x 1.1" (254 x 48.7 x 29.4mm)
    • Ball: 1.6" dia, 1.4" high (40mm diameter, 35mm high)
  • Weight: 4.8oz (136g)

Unit Ship Weight: 1 lb

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