I don’t really care about measuring the wind – I prepare for a bike trip using WeatherPro, which tells me how bad the wind will be, not how bad it is right now. But the Vaavud wind meter is notable for another reason: it communicates its wind-speed readings to your iPhone wirelessly, yet uses no electronics whatsoever. How? Read on…

If you had any doubts that the world of iPhone accessories could grow any stranger or more diverse, then throw them out now. The Shaka Wind Meter proves that there are still plenty of depths yet to plumb.

The Shaka is a simple little gadget: a fan that plugs into the headphone socket of your iPhone and tells you the wind speed. It’s made for surfers, but has many more uses than that.