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Story summary
- Rob ter Horst of Quantified Scientist compared the Apple Watch Series 12 heart sensor with a Polar H10 chest strap.
- During indoor cycling the watch’s readings matched the Polar H10 with a 1.0 correlation.
- In running the watch showed a 0.98 correlation with the chest strap and minor high-rate deviations.
- Weightlifting produced a 0.97 correlation keeping the watch above 85% of devices tested.