It is an extremely useful tool for anyone who owns a mechanical watch and needs to check its BPH (Beats per hour).

As the name implies, this app is designed to measure the BPH of your mechanical watches.

To perform this, it will display the time error per day.

It will also allow you to set the microphone direction toward your watch.

It uses the microphone to measure the sound pressure and the resulting frequency.

It determines the sound pressure level and the frequency of the sound wave.

The results are displayed on a graph.

If your watch is making a sound, you can listen to it and adjust the volume.

It can be used in the background.

The app is designed to work with a microphone.

It is not designed to work with a speaker or headphones.