+1 This device is the Scarlet TWL-1S Heat Stress Monitor. Function: Used to monitor and assess heat risk levels in indoor and outdoor environments. Measurements: Effectively measures the Thermal Work Limit (TWL) and the Wet Bulb Globe Temperature (WBGT). Features: Features an intuitive smart interface that identifies risk levels based on colors, and supports data logging. Usage: Designed to help companies comply with thermal safety regulations in extreme weather conditions.