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 temp. And this digital anemometer has a wind speed measurement range of 0.67~67.1 mph(+/- 2% of readings), Which can help you monitor wind conditions in real time. 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 - Our handheld anemometer has a tripod hole that allows ou to fix the anemometer on the triangular bracket 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. Lightweight with Carrying Bag - This lightweight and user-friendly anemometer is perfect for outdoor enthusiasts. And it comes with a waterproof carrying pouch that allows you to carry and protect the device better during outdoor activities. 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. What's in the Box - 1x HoldPeak 866B Digital Anemometer, 2x AAA Batteries, 1x User Manual, 1x Carry Pouch, 1xScrewdriver.