Vaavud Mjolnir Wind Meter

Made of a one-piece durable plastic rotor and low-friction Teflon bearing, the wind meter communicates directly to the magnetic field sensor in your smartphone

Download the free app on the Apple Store or on Google Play
Vaavud app gives you a clear overview of average, actual and maximum wind speed, as well as a real time graph; live map gives you access to measurements made by other Vaavud users globally

Units of measure can be changed by simply tapping the screen (m/s, Kmh, mph, Kts and Bft)
Because of the cup-anemometer design, the precision of the Vaavud wind meter is not affected by changes in wind direction (unlike a propeller based anemometer, which must point precisely up against the wind to measure correctly)
Measures wind speed from 4 to 48 knots (2-25 m/s)

Works with iPhone 4, 4S, 5, 5C, 5S and all iPads from 2 and onwards running on iOS 6 or 7 and Samsung Galaxy S3, S4 and HTC One
Includes neoprene storage pouch