The Handheld UV Torch is a superbly engineered tool that delivers fantastic performance for a lifetime of owner satisfaction. These UV Torches have a wave length between 365nm and 400nm. 365 - 370nm is the ideal wavelength for checking fluorescence. A UV flashlight emits ultraviolet radiation a type of light energy that is not visible to the human eye. When ultraviolet light hits certain objects, they can fluoresce a phenomenon similar to a bright glow. UV fluorescence can show over painting or retouching and identify types of stains. The offered Handheld UV Torch is made for use in the various industries.