【Multi-function Anemometer】Wind speed, wind temperature, wind chill, low battery indicator on a backlit LCD display. BT-100 is a portable wind gauge that can accurately measure wind speed in 5 units: m/s, km/h, ft/min, knots, mph. Wind temperature in ℃/℉. 【High Accuracy Wind Meter】Wind speed meter to measure wind speed range 0.3-30m/s (+/- 5 % of readings), wind temperature range -10 to 45 (+/- 2), resolution 0.1 m/s; 0.2. With 2 sensitive sensors and a sensitive 8-leaf fan, this BT100 Pro high precision anemometer can help you with HVAC installation, CFM calculation, duct ventilation. 【Tripod hole for Mounting】There is a metal threaded hole at the bottom of the anemometer, so you can mount it on a tripod to avoid strong winds. Keep your hands free when flying drones, rc planes, wings, helicopters and quads, for long distance shooting. 【Handheld Anemometer】This is a meter pocket wind gauge, lightweight and portable, which you and your family can measure outdoors for outdoor activities, such as: shooting, sailing, kite flying, climbing, driving using drones, etc. 【Easy to Use】Optional manual / auto sleep, backlight screen to let you see clearly even in the dark. 2x1.5V AAA batteries included to get you started when you receive the wind tester.