UV Checker with Mirror is a great gift for young and old.
How do they work? Well normally you can't see Ultraviolet Light - it is beyond the visible spectrum. However there are some substances that absorb UV light, and convert it to a longer wavelength, i.e. visible light. So really, we are making the invisible (UV light) visible - as "simple" as that.
Seems to be low stock.. so hurry. :-)
Damn that was fast, hope at least a couple of you got one.. :-)
cant be bothered with the 1cent shipping lol..