Operating temperature: 0℃~45℃ (32°F~113°F) Operating humidity: 40%RH~80%RH Storage temperature: -10℃~50℃(-14°F~122°F) Storage humidity: ≤80%RH Multi-Purpose: Anemometer handheld measures Wind Velocity (m/s, km/h, ft/min, knots, mph), Wind Flow (CFM/CMM), and Temperature (℃/℉), sensitive enough to detect slight movements of air, ideal for in duct HVAC and outdoor activities LCD Display: Anemometer offers comprehensive values of Air Velocity & Air Flow in Max/Min/Avg/Real Time), Temperature, 2/3 Max Airflow Value, Windchill below 0℃, and low battery indication, with optional backlight to help reading in dim areas Long Probe: Air flow meter hvac gauge equipped with 3.3ft telescopic rod and 3.3ft probe cable, enabling you to test in hard-to-reach areas, facilitating accurate measurement while convenient reading at hand Data Output: Wind velocity cfm meter allows you to record up to 5500 groups of data, which can be exported to PC (Win XP/7/10) via its USB interface for further data and graphic analysis Power Saving: Anemometer hvac gauge features power-saving design by automatically shutting off the backlight over 2-min without operation and automatically powering off the meter over 10-min if not in use Model: GT8916 Power Supply: built-in 1000mAh 3.7V Lithium battery Color: Black Material: ABS Package Contents: 1 x Hot Wire Anemometer 1 x 6.6ft Telescopic Probe 1 x Charging Cable 1 x Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.