@martinzerr I’ve tried Kardia mobile, Samsung Galaxy watch and Apple Iwatch. All 3 did well recording my heart beat traces. In most cases these devices are pretty accurate at diagnosing AF and Sinus rhythm . None are good at identifying PACs and PVCs, instead erroneously labeling these 30 sec traces as AFIB even though rate is low. However the traces are stored as PDFin smart phone and can show the quality of heart rhythm which you can share with EP. The Kardia sensor is separate; I carried it in my wallet but 2 of them stopped working within a few mos. I recommend using whichever watch that syncs with your current smartphone.