http://www.coldflower.com/kello
A simultaneous comparison of timing results for an Omega Speedmaster, mechanical chronograph. The timing analysis is performed using an iPhone app, called Kello, and a $3000 watch timing machine from Witschi.
Kello uses the microphone input that is built into the headset of the iPhone to listen to the regularity of the ticking of the watch, while the Witschi uses a piezo-electric sensor integrated into the stand in which the Omega Speedmaster is held.
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