Apple starts preorders for Watch Series 12, Ultra 4 with new Health Sensing System

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 . 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.