Check the listing for details. BTMETER Digital Handheld Wind Speed Meter for Wind Chill, Air Velocity Bluetooth. Condition: New, Made in China. Listed at 26.88 USD. High Accuracy Handheld Wind Meter BT-100-APP Thanks to the sensitive dual temp sensors, 8 vanes, smooth fan shaft, this BT-100-APP Pro Anemometer can accurately detect wind speed and temperature. Easy CFM calculation: Air Flow in CFM (Q) = Flow Velocity in Feet Per Minute (V) x Duct Cross Sectional Area (A) 【Multifunction Pro Anemometer】 Wind Speed, Temperature, Wind Chill and Battery Power in one LCD display. Digital Anemometer Handheld measure wind speed in 5 units: m/s, km/h, ft/min, knots, mph. Temperature measure in ℃,℉ 【Wireless Bluetooth Anemometer】BT-100-APP Anemometer can auto pair with your iphone, ipad ,android phone and tablet via bluetooth APP. A 1/4’’metal hole in the bottom is for you to fix the meter on a tripod for continuously testing, it can also log the data and export.