#accuracy-testing
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Apple Watch Ultra 4 In-Depth Review: As Good As the Hype?
The payoff to last week's two hands-on videos: DC Rainmaker's full in-depth Ultra 4 review after swim/bike/run/row/track testing against a Polar H10 chest strap, published the day before the watch ships. Bottom line on the sensor: "this new heart rate sensor is very accurate thus far in my testing" — genuinely excellent plots even in the hard cases (outdoor road cycling vibration, rowing hand motion) — with the caveat that cold weather, where optical HR actually struggles, hasn't been tested yet (he lives somewhere hot; Apple's own study sites were California and Malaysia).