Best windmeter yet! Versatile and convenient, the Skymate Windmeter flips open like a pocket knife to measure current, average and maximum wind speeds from .5 to 89 mph with +/-3% accuracy. It shows wind in mph, km/hr, m)sec, ft)min or Beaufort; and temperatures (plus wind chill) in Fahrenheit or Centigrade. Water resistant to 3 feet, it folds shut to 5.5" x 1.75" and it floats! 400-hour replaceable lithium battery included.