Apple Watch Series 12 Health Sensing System: The Sensors Apple Calls New, and the Four That Carry Over

Apple calls the sensor package in Apple Watch Series 12 the all-new Health Sensing System, and its own specification page puts four sensors under that name: an electrical heart sensor, an always-on optical heart sensor, a blood oxygen sensor and a temperature sensor. Only the heart sensors are described as new. Ceramic joins aluminum and titanium...