Heartly-Heart Health Recorder funktioniert nicht

This tool uses your phone's camera to measure your heart rate and provide useful health information.  Heart rate and blood pressure are the important indicator of health and fitness.  Using the Heart Rate Tracker App, you can measure and monitor your heart rate, and record your BP level.  The Heartrate Test is the most accurate application for measuring your heart rate and pulse.  In addition, a heart rate monitor allows you to share your heart rate with friends and family.  The tracker in this APP is your reliable, safe, and fast assistant that can help you track blood pressure trends and blood sugar, find blood pressure information, and provide tips for a healthy lifestyle that is beneficial to your health.  The Heartrate Test can help you effectively understand your heart rate.  Get a free heart rate monitor app to embrace a healthy heart.  You can use the Heartbeat app without the Internet, so your heart rate can be recorded wherever you are.  After a few seconds, you will get a heart rate result.  Our app uses your phone's camera to capture images and uses algorithms to recognize heartbeats.  Simply place your fingertips on the camera to obtain your heartbeat in a few seconds.  It is recommended to take multiple measurements throughout the day to ensure accuracy, especially when you wake up in the morning, before going to bed, and after exercising.  Gently cover the rear camera lens with your fingertips and hold still.  For accurate measurements, please stay in a well lit area or turn on your flashlight.  Its accuracy has been verified through comprehensive professional experiments.