Rotate your phone to face the wind. The application comes with a beautifully designed windmill that rotates according to the wind strength. The measures come with all international units : km/h, m/s, knots, miles, and even the Beaufort scale. Enjoy your anemometer and measure the wind everywhere. Don't forget to rate the application if you like it ! Apple's standard terms of use apply to all subscriptions available in the application. You can find all the information by following this link: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/