Measure the rate (seconds/day) and beat error (ms) of mechanical watches using the phone microphone.
* Get results in 60 seconds
* No external hardware required
* Two measurement screens
* Should work even if a small amount of background noise is present
* Automatic beats per hour detection.
* Custom beats per hour setting.
* Saving and comparing multiple results

The measured values for the same watch can very depending on:
- The position of the watch.
- The power reserve of the watch.
The measured values are estimation and can be different from the actual ones.