With Apple Watch Series 4, Apple added a electrocardiogram monitoring (also known as ECG and EKG). The ECG app on Apple Watch (Series 4 or newer) can record your heartbeat and rhythm using the ...

Take an ECG: Starting with the Apple Watch Series 4, you can take an ECG. This FDA-approved technology can help you identify possible atrial fibrillation, a form of irregular heart rhythm.

For those who just want a basic Apple Watch primarily for activity tracking and don't want to spend a whole lot of money for health features like ECG along with the faster chip and the always-on ...