Wet-Bulb Globe Temperature (WBGT) Heat Stress MeterMeasures ambient temperature, humidity, wet bulb temperature, black globe temperature, WBGT (wet bulb global temperature), heat stress index, dew point and pressure Heat Stress Index measures how hot it feels when humidity is combined with temperature, air movement and radiant heat Black Globe Temperature (GT) monitors the effects of direct solar radiation on an exposed surface In Out function displays the WBGT value with or without direct sun