Apple Watch Series 12 Review Highlights Health Intelligence Sensors

The Apple Watch Series 12 introduces a new health sensor on its underside that samples heart rate every five seconds and HRV every five minutes.

The device features a new Readiness Score combining sleep, heart rate, and activity metrics, requiring a full week of continuous nighttime wear to populate.

Powered by the new S11 chip for improved power efficiency and on-device AI, the watch includes fast charging providing 12 hours of use from a 15-minute charge.