Extech HT200 Handheld Heat Stress WBGT Meter features accurate heat stress level measurements by factoring in temperature, humidity, air movement, and direct solar radiation. The Extech HT200 can store up to 50 data measurements, has an easy-to-read, backlit LCD, and precise readings of Wet Bulb Globe Temperature (WBGT), Relative Humidity (%RH), Black Globe Temperature (TG), Air Temperature (TA), Wet Bulb (WT), and Dew Point (DEW).