Some smartwatches are actually making up their readings – which is why I keep telling you people never to buy cheap, unbranded Apple Watch dupes

Person checks blood glucose on smartwatch.

• Germany's Federal Network Agency investigated suspicious listings of tech products, including smartwatches
• Many of these products are advertising glucose monitoring features
• There is no reliable non-invasive way of monitoring glucose, and some watches were found to simply estimate or make up readings

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