The Apple Watch may gain the ability to measure blood pressure, blood glucose, and blood alcohol levels, according to revealed information about one of Apple’s chosen business partners.

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Apple has been revealed to be the largest customer of the British electronics start-up Rockley Photonics.
The company has been developing optical sensors, and their newest development is a non-invasive optical sensor that can detect multiple blood-related health metrics. The new sensor can detect blood pressure, blood glucose and blood alcohol levels, many of which are only detectable with dedicated medical equipment. Rockley’s sensors beam infrared light through a user’s skin, much like the existing sensors on the back of the Apple Watch for detecting heart rate and blood oxygen levels.