Apple Watch Series 12 introduces a new Health Sensing System, higher-frequency heart-rate and heart-rate-variability readings, and a readiness score. Apple announced the watch on September 9, with Apple’s health release and independent product reporting providing the details.
Apple says the redesigned sensor system is intended to improve heart-rate accuracy during movement. The company also says the S11 chip supports the new sensing work and upcoming Audio Intelligence features when the watch is paired with a compatible iPhone.
MacRumors reported that the watch can measure heart rate every five seconds through the day. It also reported that heart-rate variability can be sampled up to 24 times more often, with recovery and overall HRV shown in a dedicated part of the Heart Rate app.
The new readiness experience is designed to help users interpret whether their body is prepared for the day. Apple has not described it as a diagnosis, and the company’s health materials continue to position the watch as a tool for wellness, fitness and safety rather than a replacement for medical care.
Series 12 also adds a daytime vitals view, a guided VO2 Max test and a redesigned step-counting model. MacRumors reported a new steps complication for the watch face, while Apple described higher-frequency heart sensing and a redesigned Health app coming to iPhone later this year.
Apple says the watch can deliver up to 10 hours during an outdoor workout, which is 25 percent more than the previous model. The Apple Watch Ultra 4 has separate battery figures, so those claims should not be applied to Series 12 or treated as a single figure for the entire range.
Apple Watch Series 12 starts at $399, with preorders beginning September 9 and availability on September 18. The new sensors and scoring tools will need independent testing before their accuracy can be judged, but the hardware and software additions are now part of Apple’s confirmed product specifications.
