An OSHA-oriented heat stress meter and data logger that measures Wet Bulb Globe Temperature (WBGT) along with humidity and direct/radiant sunlight to gauge real workplace heat exposure. Includes an adjustable audible WBGT alarm, an indoor-measurement mode, and a data logging function that samples every 1-3600 seconds onto the included 16GB SD card. Bundled with an AC power adapter for continuous monitoring setups.