Blood oxygen sensor, electrical heart sensor, third-generation optical heart sensor, temperature sensor, high-g accelerometer, high dynamic range gyroscope:. Winner: Apple Watch Series 9.. This $280 watch lacks some of the Series 6's more advanced capabilities, like its blood oxygen sensor, always-on screen, and ECG reader, but still offers the larger screen found on newer models.

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The Apple Watch Series 9 has either a 41mm or 45mm display with two exclusive features: an S9 chip that's faster and smarter with a new four-core Neural Engine, and the new double-tap gesture.. Press the Digital Crown on the right side of your Apple Watch to open the app galaxy screen. Here, select the Blood Oxygen app. Tap "Start" to begin the measurement. The process takes 15 seconds. During that time, rest your wrist on a table or other flat surface. After 15 seconds, you'll see your blood oxygen levels.