Review on Wintact Handheld Anemometer Small Digital Vane Wind Speed Meter Gauge, Pocket Air Flow Velocity Tester With Measuring Wind Temperature 14℉ To 113℉ For House HVAC Duct Outdoor Kite Boat Sailing Surfing by Nguyen Taylor

Pretty good for the price. You have to take the case off to change units of measurement. Under reads by 3-5 mp it appears to me, probably because the little fan deal is too small to be really accurate. I use it just to get a baseline of wind speed for curiosity, not anything mission critical, so it serves that purpose because it's portable and easy to use.