I was looking into grabbing one of the Kardia EKG devices, but damn, their "supported" android devices list is awfully slim and there's no real indication if it would work with a device running android 10 that isn't on the list. 
www.alivecor.com

AliveCor
Record your own EKG, anywhere and anytime, with AliveCor's KardiaMobile 6L. Get instant medical grade results that detect Atrial Fibrillation (AF). FDA-cleared: clinically proven and used by the world's leading cardiologists.