Remote Monitoring via Bluetooth: By connecting the mobile APP via Bluetooth, you can easily monitor real-time data and view historical data remotely (Just download our APP, and the digital anemometer can be automatically connected via Bluetooth.) Highly Accurate Wind Meter: Thanks to the sensitive dual temp sensors, 8 vanes, smooth fan shaft, the HoldPeak 866B Anemometer can accurately detect wind speed, wind chill and temperature. Which can help you monitor wind conditions in real time and calculate the CFM Professional & Multifunctional: This Pro wind speed meter has functions such as: unit switching of wind speed(m/s, km/h, ft/min, knots, mph) and wind temp(℃,℉), Max/Min/Average Wind Speed, battery level display, auto off, backlight, etc. Which can meet various measuring demands With Tripod Hole & Hand Strap: This hand held anemometer has a tripod hole that allows you to free your hands while measuring. It also comes with a hand strap, which prevents it from being dropped or lost. This ensures every shooting, sailing, or drone flying safer and more enjoyable Wide Applications: This handheld wind meter is ideal for outdoor activities like surfing, drone flying, kite flying, boating, golf, etc. And it is sensitive to measure very low air flow in HVAC installation, duct vent. Which can be a good helper in CFM calculation. You can simply calculate the CFM: Air Flow in CFM =Wind speed x Duct Cross Sectional Area Wide Applications: This handheld wind meter is ideal for outdoor activities like surfing, drone flying, kite flying, boating, golf, etc. And it is sensitive to measure very low air flow in HVAC installation, duct vent. Which can be a good helper in CFM calculation. You can simply calculate the CFM: Air Flow in CFM =Wind speed x Duct Cross Sectional Area;