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Apple will be continuing with the development. But not sure when it will come to the watch. Anyway don't think it is a feature that will be here in the next 5 years at least.
We’ll see the fully activated blood oxygen sensor back in the Apple Watch ⌚️ way before the Blood glucose sensor will debut in the Apple Watch ⌚️

Who knows though as Apple could buy some startup company who invented a genius method to reading blood glucose.
 
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