Tried and tested this accurate Anemometer on top of a hill in gales. Calibrated it in my car at 30, 40, 50, 60, 70 mph and found most accurate and correlating to car speed.

Specs:
Explorer 2 Wind Gauge Features
Wind speed
Max wind speed
Temperature - current, maximum, minimum and water
Wind chill
Water temperature is read quickly by submerging the unit briefly
Reads in MPH, KPH, Knots, feet/second and meter/second, Fahrenheit and Celsius
Exceptional accuracy in a small package
Balanced impeller is integrated into wind meter
EL backlight with double-press of button
Stainless steel back
Waterproof (submersible up to 6 feet)
Replaceable Lithium battery (included and installed)
Includes lanyard
Designed in Switzerland
Xplorer 2 Specifications
Wind Speed Range
Up to 94 mph / 150 kph
Accuracy
+/- 3%
Measuring Cycle
Twice per second
Battery
One CR 2032 Lithium (Included

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