[WBGT Index] The full name is wet bulb temperature, which is the wet bulb black globe temperature index. This is a basic parameter that can comprehensively evaluate the heat load of the human body in contact with the working environment. The unit is Celsius (). It not only takes into account temperature, but also comprehensively considers the effects of humidity and radiant heat, especially the effect of humidity, to evaluate the average heat load of the human body. [Easy to use] The switchable input/output function displays the WGBT value with or without direct sunlight, directly measuring the radiation effect of the exposed ABS black ball [Four alarm levels] 4 indicators display the heat stress alarm level (warning, extreme warning, danger, extreme danger) [Wide application scenarios] It is widely used in outdoor/indoor sports training, construction, mining and steel industries, beach activities, etc. Colour:White Material:ABS Power Supply: 2 x AAA batteries(Not included batteries) Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * WBGT Meter Heat Index Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.