Heart Rate Monitor Track Pulse funktioniert nicht

No additional devices needed! - Save your heart rate measurements, blood pressure mesurements, water intake to the Apple Health app.  To start measure your heart rate, just place finger on the camera.  Use your iPhone to find out your heart rate in less than 12 seconds!  Be sure your fingertip covers the camera lens and camera flashlight completely. Press gently.  App is not intended to diagnose, prevent or treat any condition, or to be a substitute for professional medical care.  You just need phone camera and finger.  It is meant only as a source of general health information.  Go to the 'Settings' section and anable Health App.  Pressing too hard may result in make it more difficult to get an accurate result.  You can subscribe to get unlimited access to all app’s features.  The app is not designed for medical purposes.  App is not a clinical pulse oximeter.  Subscriptions are billed automatically at the rate depending on the selected subscription plan.