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Apple Watch Series 12 with the Health Sensing System: two watches on a Milanese loop band, one showing the Heart Rate app with a 62 BPM reading, the other showing the optical sensor's green LEDs

Sep 12, 2026

Apple Watch Series 12 Reads Your Heart Every Five Seconds

The Series 12 and Ultra 4 add a Health Sensing System that samples heart rate every five seconds and HRV every five minutes, plus a Readiness score built on it.

By TPW Editorial9 min read