Measures Wet Bulb Globe Temperature (WBGT), Thermal Work Limit (TWL), heat index, temperature, humidity and much more. 15 measurements in all! Waterless! Natural Wet Bulb Temperature accurately calculated from on-board digital sensors with no tedious setup or maintenance Large, hi-res, hi-contrast, graphic display is perfectly readable in the brightest sunlight and is backlit for use in low-light conditions Handheld, portable, data logger with customizable warning flag settings, graphing and measurement statistics Optional LiNK connectivity powered by Bluetooth Smart® provides wireless communication to mobile devices and computers Rugged (drop tested to MIL-STD-810G standards), waterproof (sealed to IP67 standards) and floats Protective pouch, neck lanyard and Lithium AA battery included 5-year warranty