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I'm not diabetic, but I tried a FreeStyle Libre 2 continuous glucose monitor to measure my blood sugar, and I think it's basically what you are asking for. Tap your phone on a patch on your arm to get a instant view of your blood sugar, plus see the previous 8 hours. It is pricey though.

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My understanding is that all current devices like this use a thin sensor "fiber" that is inserted under the skin, which is then connected to the coms-unit, which is in the sticker which remains on top of the skin. So they are still somewhat invasive.

And also annoying if your body really doesn't like them since they clog up after at most a day with me... (I've used them a few time since they were the size of bread boxes with long wires and the results after about a day always become erradic and unpredictable)

It is expensive, but testing with strips >5x a day can easily end up costing more. When I was on strips I usually needed at least that to have anywhere near decent control.

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