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Light up loupe
Install LED light in generic loupe
I bought a cheap double lense-loupe on eBay for less than 10 EUR to install an LED with a push-button. To power the LED, I designed and printed this holder for a single CR2032 button cell / battery.
I mounted it with hot glue, and it's practically invisible when using the loupe. I mounted a simple push-button on the outside.