General Tools Deluxe Heat Index Monitor #WBGT8778 With 75 x 75 mm Brass Black Ball, 32 to 122 F, 0 to 100% RH

MONITOR HEAT CONDITIONS: Measures and displays the ambient temperature, relative humidity (RH), and the dew point and wet bulb temperatures | IDEAL FOR: This heat index monitor is ideal for industrial uses including HVAC/R and outdoor sports medicine applications | MEASURES: WBGT (Wet Bulb Globe Temperature); TG (Globe Temperature); TA (Air Temperature); % (Relative Humidity). | RANGE: Temperature measurement range of 32 F to 122 F and wet bulb temperature measurement range of 70 F to 115 F | INCLUDES: Heat Index Monitor, 2 AAA batteries, user manual