The PPG sensors on Apple Watch that uses infrared sensors, photodiodes... | Download Scientific Diagram
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Inside Apple Watch - battery, S1, Digital Crown and sensors making the Apple Watch tick | IBTimes UK
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Apple Watch invention enables True Tone display tech by measuring ambient light through a user's skin | AppleInsider
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Apple Watch Series 3 Smartwatch (GPS, 38mm) (Ambient Light Sensor, MTF02HN/A, Space Grey/Black, Sport Band)
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