@glitterchromatic That is why the wearer of the watch might wish to educate his/herself about what the watch's ECG looks like when the heart rhythm is normal, near normal, abnormal, and showing clear signs of AF (atrial fibrillation). If your watch keeps saying you have some AF, then take frequent ECGs and look at their graphic representation. AF shows as an ECG with no p-wave and continuously varying intervals between the r-to-r peaks. Once your brain 'sees' and knows what to look for, there will be no mistake about whether-or-not it's AF. I sent my Samsung Galaxy's readout, downloaded to my PC, to my electrophysiologist because it clearly showed no p-wave and the peak-to-peak intervals were all over the place in length. He immediately replied that, yup, you have recurrent AF and he later scheduled me for a second ablation, no questions asked (Galaxy watch redout was good enough).