Reviewed by Corey Noles After more than a year in patent purgatory, Apple officially brought blood oxygen monitoring back to U.S. Apple Watches today. But here's the kicker: reading your SpO2 levels just got a lot more complicated. The feature that once displayed readings directly on your wrist now requires a detour through your iPhone's Health app, thanks to Apple's workaround to sidestep Masimo's iron-clad patents. What you need to know: This isn't the seamless health tracking you remember....
