1. CFM AnemometerBuilt with lightweight vane sensor to ensure sensitivity for accurate air flow measurement. Extendable cable and wand can extend to 79 inches, making this cfm wind speed meter tester able to easily reach the air outlet of AC, Vent. 2. Pro Airflow Air Velocity MeterAccurately measure wind speed ranging from 0.001100Mph (/ 5% of reading), wind temperature from 14113℉(/ 1.8℉). 5 wind speed units are optional: m/s, Ft/min, Knots, Km/hr, Mph; ℃/℉ is switchable. 3. Wide Applications Wind DetectorThe handheld wind indicator can be applied in HVAC system installation and checking, dust vent detection, air conditioner maintenance, and also for outdoor activities such as hiking, camping, boat sailing, sky surfing, shooting, drone flying. 4. Designed AnemometerFor continuous measurement, you can fix the gauge on a tripod with the thread hole at the bottom. It has an auto/manual power off function for battery saving. The backlight LCD provides clear reading in darkness or dim places.