
The Apple Watch Ultra 3 is built for extreme environments: 100m water resistance with a depth gauge for diving, 42-hour battery life, and the full suite of Apple health sensors including ECG, HRV, SpO2, GPS, and skin temperature. The ultimate Apple wearable for outdoor adventurers and divers.
Sleep staging with respiratory rate and wrist temperature
Continuous HRV with Apple Health trends
Blood oxygen monitoring on demand and during sleep
FDA-cleared single-lead ECG from the wrist
Precision dual-frequency L1/L5 GPS
All-day step and activity ring tracking
Mindfulness and stress management via Reflect app
Auto-detection plus depth gauge for diving workouts
Full iPhone notification mirroring with siren and action button
Cycle tracking with ovulation estimates via wrist temperature
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