The Apple Watch’s wrist detection and pulse measurement features often fail to work when confronted by dark tattoos. Michael Lovell made the video below illustrating the problem and a Reddit user called Guinne55fan flagged up the same issues. Reddit also produced an explanation about why the technique used by Apple – pulse oximetry – leads the device to end up befuddled by beautiful body art and not simply darker skin in general: Comment from discussion Anyone with tattoos and the watch please read.. I asked Dr Sijung Hu, Leader of the Photonics Engineering and Health Technology Research Group at Loughborough University’s…
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