If you have a device that will give you a standard ECG readout, with the graph-paper look and all the squiggles, you can easily tell if you have AF if two artefacts show in the squiggles: There is no P wave, the first little distinct blip before the large peak, and if the peaks, themselves, are not all the same distance apart. AF shows clearly as R-wave, or QRS- complexes, that are quite obviously NOT the same distance from each other. In my Samsung Galaxy watch's case, the readout is as easy as pie to see, revealing abnormal rhythm but not AF (it says 'unable to determine' or it will say definitively 'AF detected, consult your physician').
