For heart rate testing, Horst used a Polar H10 chest strap as the benchmark. The Apple Watch Ultra 2, running watchOS 26 beta, delivered results that were nearly identical to the strap during indoor ...
After two years at the top of Apple’s smartwatch lineup, the Ultra 2 was replaced by the Ultra in September 2025. And with our initial extensive Apple Watch Ultra 3 testing now complete, we can move ...
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