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Apple glucose monitor rumors, Marvel fatigue, and podcast misinformation
The Vergecast
The Problem With Blood Glucose Measurements
In the case of the PPG sensors, these are the green lights that you see on the back of every wearable that measures your heart rate. That color of light is very much impacted by melanin and by tattoo ink. A lot of tattoo users who have very dense tattoos on their wrists cannot use the Apple Watch properly. They have to get epoxy stickers and stick that on. And somehow that makes it work. It's slightly different in the case of blood glucose because if you're going to be using a type of infrared wavelength. But that causes its own problems as well.
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