??Pocket Sized Portable Anemometer?The BTMETER BT-817A can deliver accurate wind speed readings between 0.66mph to 67mph, wind temperature: 14 to 113°F,Resolution 0.1m/s ±32°F ??Wind Speed Temperature Measurement ?It measures wind speed in 5 units:mph, m/s, ft/min, knots, km/h; Temperature in 2 units:Celsius,Fahrenheit ??More Powerful Features?Beaufort wind scale bar graph, MAX/MIN/AVG/Current, Wind Chill Indicator, Manual/Auto Power OFF, Backlit. Comes with long Lanyard for hang around your neck, ad get a wind reading without taking it off. ??Too windy to Fly Your Drone??Easy to operate anmemometer to let you know how much winds you're dealing with. Use the Average to get a more accurate wind measurements in changing conditions. Whether you're shooting, flying quadcopter, Kites, Drones, Planes,BT-817A digital anemometer can help you figure out if it's too windy to fly. ??Necessary Meter for HVAC DIY Work?Light weight portable wind meter,it's easy to carry around to measure HVAC register flows in various rooms, pipes. This Anemometer does NOT measure CFM directly, but you can use the average result to calculate cfm. Or check the air speed before and after the improvements you made.