Sensors in the Apple Watch

  • Blood oxygen sensor
  • Electrical heart sensor
  • Third-generation optical heart sensor
  • Temperature sensor
  • Always-on altimeter: an instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude. Apple docs.
  • High-g accelerometer
  • Gyroscope
  • Compass
  • Depth gauge and water temperature sensor (Apple Watch Ultra)

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