
Apple Watch Series 12 Heart Sensor Accuracy Tested Against ECG Standards
Independent testing confirms the Apple Watch Series 12's new heart rate sensor delivers high accuracy during cycling and running, though it shows minor deviations during weightlifting. The device features a redesigned sensor array that enables continuous five-second heart rate polling, a key upgrade over previous models. While the hardware refresh improves health data granularity, some users note slightly larger bezels and a protruding Digital Crown due to the expanded internal sensor stack.











