Does apple watch 4,5,6 have same ecg sensor?
I wonder if apple watch series 4,5,6 have same sensors for ecg detection.
Apple Watch
Question marked as
Essentially yes. All three are described together in the "How the ECG app works" section of:
Taking an ECG with the ECG app on Apple Watch Series 4, Series 5, or Series 6 - Apple Support
and the "How Apple Watch measures your heart rate" section of:
Monitor your heart rate with Apple Watch - Apple Support