ion: 1- Quick-response capacitance sensor, accurate measurement for wet bulb globe temperature(WBGT), black globe temperature(TG), humidity(%RH), air temperature(TA), wet bulb(WET) and dew point(DEW). 2- Max/Min and data hold. 3- Low battery indication. 4- LCD display with LED backlight. 5- Viewing data records. 6- Switch the temperature unit to C or F. 7- Brass black ball in 50mm diameter. 8- WBGT alarm setting. 9- Auto power off with disable function. 10- Data logging capacity: 12000 records, USB PC serial interface (TM-188D). 11- Sampling interval: Max 24 hours; Min 1 Second (TM-188D). Application: 1.The HEAT STRESS WBGT METER is quick-response with accurate measurement for the effects of temperature, humidity, and direct or radiant sunlight. 2.This instrument is ideal for the athletic trainers, military, occupational (Industrial) hygienists, outdoor worker and the sports medicine specialists; and it's designed according to the regulations mentioned below. In order to measure the WBGT index, you should refer to the following regulations: ISO7243 : Hot environments. Estimation of the heat stress on working man. ISO7726 : Ergonomics of the thermal environment-instruments for measuring physical quantities. Specifications& 65306; 1- Dimension : 300 X 70 X 50mm (L X W X H) 2- Weight : 220g. 3- Power supply : 006P 9V,or AC100~240V DC 9V/ 0.5A(9mm). 4- Battery life : 200 hours. 5- Operating Temperature & Humidity :0C to +50C. 6- Storage temperature & humidity : -10C to +50C . 7- Data output :USB PC serial interface,12000 records. 8- LCD: 52mm(W)X36mm(L) monochrome LCD and backlight