4. Blood oxygen readings
Rick Stella/Insider
One of many extra spectacular options the Apple Watch provides is its blood oxygen sensor. When used, it is in a position to measure the oxygen saturation of your blood in roughly 15 seconds.
To log a studying, the watch’s built-in optical coronary heart sensor shines crimson and inexperienced LED gentle and infrared gentle onto your wrist to measure the quantity of sunshine mirrored again. It then makes use of an algorithm to calculate the colour of your blood; vivid crimson blood has extra oxygen whereas darkish crimson blood has much less.
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