Extech HT30 Heat Stress WBGT Meter

The Extech HT30 is a professional-grade instrument designed to assess heat stress using the Wet Bulb Globe Temperature (WBGT) index. This method goes beyond a simple temperature reading by combining four critical environmental factors: air temperature, relative humidity, radiant heat from the sun or hot surfaces, and airflow. The result is a more realistic measurement of how hot an environment feels to the human body, making it a vital tool for safety monitoring in demanding conditions.

Equipped with a black globe sensor, the HT30 accurately measures radiant heat exposure—an essential factor for outdoor work sites, athletic fields, and industrial environments. It can display WBGT values for both direct sunlight and shaded conditions, helping users compare and adjust activities accordingly.

• Measures WBGT index, air temperature, black globe temperature, and relative humidity.
• “IN/OUT” function for shaded vs. sun-exposed readings.
• Wide measurement ranges to handle a variety of climates.
• Compact, lightweight, and battery-powered for portability.
• Auto power-off to extend battery life (with override option).