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Message: <blockquote data-quote="KennyA" data-source="post: 2607390" data-attributes="member: 517579">I've had these things advertised to me, and took a look. The ones I have seen all say they are "non-invasive" which I think means they are not actually directly measuring blood glucose, but a proxy for it. This is not necessarily a bad thing - CGMs use a proxy (and are still "invasive") because they measure the glucose in interstitial fluid rather than blood, for example, but I'd want to know a bit more about what exactly the gadget is doing, what it's really measuring, what its assumptions are, what its total acceptable error is etc. If it is both accurate and reliable the watches cost only a little more than a couple of weeks' Libre; if it isn't, it's junk.</blockquote>

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