Extech Temperature gauge HT200 Cal

The heat stress meter measures Wet Bulb Globe Temperature, black globe temperature, humidity, air temperature, wet bulb temperature, and dew point. A combination of humidity, temperature, air movement, and direct sunlight accurately determines the heat load on the body. The device uses a capacitive sensor for precise measurement of Wet Bulb Globe Temperature (WBGT), black globe temperature (TG), relative humidity (% RH), air temperature (TA), wet bulb temperature (WT), and dew point (DEW). The black globe temperature (TG) monitors the effects of direct sunlight on an exposed surface. The product features an indoor/outdoor function that calculates the WBGT value with or without direct sunlight, an acoustic and visual WBGT high and low alarm function, min/max, data hold, an automatic shut-off function with a deactivation option, and a battery indicator.