New Apple Intelligence features, too.
Apple announced the Watch Series 12 and Ultra 4 today. Both include a new “Health Sensing System” and S11 chip that give the devices the “most accurate heart rate sensing in a wearable,” Apple claimed during its fall event.
Apple’s depiction of the S11 chip.
Credit:
Apple
Both watches will use the new S11 chip alongside the new “Health Sensing System,” allowing the watches to deliver higher-frequency heart rate and heart rate variability (HRV) measurements than prior Apple Watches.
The Watch Series 12 and Ultra 4 (pictured) will run watchOS 27.
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Source: Ars Technica
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- Wire dispatch directly ingested from Ars Technica - All content.
- Published at Wed, 09 Sep 2026 18:47.
- Source URL: https://arstechnica.com/gadgets/2026/09/apple-watch-series-12-ultra-4-have-wearables-most-accurate-heart-rate-sensing/