Apple Watch Series 12 review: new Health Sensing system and Readiness app

The Apple Watch Series 12 debuts Apple's Health Sensing system with its most accurate heart rate tracking yet: readings every 5 seconds and HRV every 5 minutes, 60 and 24 times more frequent than before. New metrics include Recovery HRV Average, Daytime Vitals and Health Age, plus a redesigned Health app with a Longevity tab. Pricing is unchanged from the previous generation.

• Heart rate sampled every 5 seconds, HRV every 5 minutes — 60x and 24x more often
• 0.998 correlation with a Polar H10 chest strap vs 0.943 for Pixel Watch 5
• New metrics: Recovery HRV Average, Daytime Vitals and Health Age
• No price increase over the previous generation