WatchOS 5.1.2 for Apple Watch Series 4 to bring ECG functionality, according to an internal Apple Store training document. The version is currently in beta testing. WatchOS 5.1.2 will feature an ECG app that can indicate whether your heart rhythm shows signs of atrial fibrillation, a serious form of irregular heart rhythm, or a normal sinus rhythm. Continue reading “Watch OS 5.1.2 to bring ECG functionality to Apple Watch Series 4”