PCE-WB 20SD is a multifunction data-logging hygrometer. This hygrometer measures indoor / outdoor wet bulb globe temperature (WBGT), black globe temperature (TG), wet bulb temperature (WB), dew point temperature, air temperature (TA) and relative humidity. Thus, this multipurpose data-recording hygrometer is an ideal tool for evaluating heat stress risks in different work environments. - Programmable WBGT alarm setting with audible and visual alerts - Manual (push-button) or automatic (adjustable 1 … 3600 sec) sampling - SD card memory (1 … 16 GB) allows for quick and easy data transfer to a PC