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This ingenious invention shows where people have failed to properly apply sun cream.
The gadget has a tiny black and white camera with a filter that captures UV light.
If sun cream is applied properly and the skin is protected then it will appear black, while unprotected patches show up in a paler shade.
'Sunscreenr' is the creation of American enterprise, Voxelight, who designed the safety measure as a response to shocking rates of skin cancer.