I recommend using https://www.alivecor.com/ https://www.alivecor.com/ (I have one) - this one actually performs ECG (can be used on hands, but the best results

I recommend using https://www.alivecor.com/ https://www.alivecor.com/ (I have one) - this one actually performs ECG (can be used on hands, but the best results are when used on one's chest). Just measuring pulse gives a very indirect, and unspecific, information of arrhythmia. (Still, it is great that even such data can be used to save health or live.)