Professional Measurement & Fast Response: Equipped with consistent sensors ±1.5°C temperature and ±3% humidity accuracy with quick 0.5 second sampling, additionally a 50mm dark sphere for accurate body heat radiation assessment Comprehensive Environmental: The ST8917A heat stress monitor tracks WBGT, surrounding temperature, humidity, condensation point, wet bulb reading, and air pressure in single compact device Large Data Storage Capacity: Stores up to 500 readings with high / low values tracking capability, making this WBGT tool excellent for occupational health, site inspections, and compliance documentation needs Intelligent 4 Stage Alert structure: Features color coded visual indicators ( white / green / yellow / red) with optional sound notification that automatically displays WBGT risk levels, including critical alerts when measurements overcome 32.2°C for prompt awareness Ergonomic Handheld Design: Lightweight 160g frame with textured grip, large LCD illuminated display, and compact 66x32x242mm size runs on standard batteries, Manufacturer: Kelisdi