- Series 12 uses the S11 chip and an updated Health Sensing System.
- Heart rate readings are sampled every five seconds; HRV measured as often as every five minutes.
- Apple claims improved accuracy and a readiness score feature powered by the new sensors.
- Design largely unchanged from Series 11; new colorways and material options (ceramic, polished titanium).
- Aluminum models use Ceramic Shield 2, claimed 60% tougher than prior glass.
- Series 12 pricing starts at $399 and models are available in multiple sizes.
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