With each new Apple Watch iteration, Apple has integrated additional health sensors. Over time, the device has gained the ability to track temperature changes and blood oxygen saturation, a feature that recently landed the company in hot water. In recent years, it has also had an electrocardiogram (ECG or EKG) sensor, which has been around since the introduction of the Apple Watch Series 4.
What is Apple Watch ECG? Advice to set up your heart health features
Everything you need to know about Apple's ECG heart feature, including its limitations.
Apple