Features:.  WBGT (wet-bulb globe temperature) became widespread for the use in workplaces and sports situation.  Using to control and monitor of physical activity in hot environment to limit the danger of heat related injuries.  Adjustable WBGT alarm setting, if the WBGT value over the alarm threshold, the buzzer will sound along with the flashing Display.  3 ways to use, wear in your arm or mount it on the tripod, walls.  4 Dangerous Level indicator display: Caution / Vigilance / Strict / Danger.    Specifications:  Color: black&white  Temp. range: 0-50℃/32-122℉  Temp. resolution: 0.1℃/0.1℉  Black Ball Temp. range: 0-80℃/32-176℉    Black Ball Temp. resolution: 0.1℃/0.1℉  Relative humidity range:  Relative humidity resolution: 0.1 RH  Heat Stroke Index(WBGT) range: 0-50℃/32-122℉  Heat Stroke Index(WBGT) resolution: 0.1℃/0.1℉  WBGT Temp.: IN(indoor), OUT(outdoor)  Operating condition: 0~50°C/32-122℉, 10~90% RH  Storage condition: -10~55°C/14-131℉, 10~90% RH  Powered by: 2 * 1.5V AAA(not included)  Item size: about 117 * 59 * 45mm    Packing List:  1 * WBGT Meter  1 * Arm Strap  1 * English Instruction Manual