Simultaneously display WBGT, temperature & humidity one button switch to check air/ globe temperature & in/out WBGT Designed with capacitance type humidity sensor to get accurate and quick reading red/orange/yellow, 3 color backlights as WBGT condition reminder, easy to read big LCD display with 6 dust proof rubber keys. Clear sheath to protect humidity sensor during storage filter to protect humidity sensor from dust scratch during operation, 75mm black metal ball to measure globe temperature. Temperature unit C/ F selectable, hold function to freeze reading, Max/Min function included, battery low indicator & sleep mode can be disabled. Tripod receptacle design for long time use Audible beeper for danger zone warning. Built-in PC interface for real time download. Humidity self-calibration via salt bottles kit.