Apple Watch heart monitor is rated pretty good!

Apple Watch heart monitor is rated pretty good!

The Apple Watch heart monitor is reliable and accurate. The results are as good as the Mio Alpha results.  Apple Watch

During a workout, the Apple Watch measures the heart rate often, to get an exact result.

But there is one restriction: If you wear a tattoo on your wrist there can be inaccuracies with the measurement, which is confirmed by Apple.