Earlier this month Zepp has announced its latest smartwatch – the Zepp Z – and now owners in the brand’s homeland are about to be treated to an ECG update. The ECG feature does come at a cost though.

Apple Watch Series 4 has two FDA-cleared heart features that can warn about life-threatening conditions. Here's what happened when I tested Apple's ECG against a medical-grade EKG. Vanessa is a lead ...