Meet the Hakaruno: a smart tape measure that lets you record measurements and use them on your smartphone over photos you have captured. You can use something like this to display sizes on clothing items or anything else for that matter. The device offers 5mm increments.
The data is sent to your smartphone via Bluetooth. Just bring your iOS 10, Android 6.0 or later, and you are ready to go. More info is available here.
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