The application uses the build-in or headset’s microphone to record audible ticks of the watch.
Use this application in a quiet environment. Any ambient noise can affect result accuracy. Complete silence is the best however noise cancelling algorithm can help to eliminate not very loud sounds.The recommended way to record the ticks is to touch the crown of the watch with the headset (earplugs) microphone.
If you don’t need the frequency diagram, look at Watch Tuner app.
If you want to test only the rate accuracy, try Watch Tuner Lite.
If you have any questions, suggestions or any troubles using this app – don’t hesitate to write me.