Weatherhawk Wm-100 Windmate Hand-held Wind Meter Water resistant, tripod fitting, wind vane, auto shutoff feature and uses replaceable lithium battery Measures current, average, maximum wind speed in MPH, KMPH, KNT, FPM, MPS, BF Best value for a quality wind meter, accurate to 3%, comes with two year warranty and a lanyard Measures wind 0.1 to 89 MPH, measures average and maximum wind speed over 5, 10, or 15 seconds Jackknife case protects and functions as handle, along with wind vane improves user accuracy, replaceable non-corroding impeller