The Watch Tuner display include a +-Cents tuning offset indication for tuning accuracy, a frequency readout , as well as a metering dot. The metering dot moves to the center and turns green when an audio pitch is detected to be in tune.
Before first using the Watch app, please launch the iOS app and grant Permission to use Microphone when prompted. You can also grant Microphone Permission in your iPhone’s Settings, under Privacy.
For tuning your musical instrument with just your iPhone, please look in the iOS App Store for the HotPaw Guitar and Chromatic Strobe tuners.