Amazfit Stratos allows you monitor your heart rate automatically and continuously. You can switch the measuring methods in Heart Rate Widget.
To measure heart rate automatically, swipe left from the watch face ➡Heart Rate➡ Tap check now.
When measuring, please don’t move so that the watch can get more accurate heart rate data.
Note: For the most accurate heart-rate reading, please wear your watch properly and avoid wearing sunscreen or lotion under the device. Clean the heart rate monitor after exercising.