GGI 41 LED Professional UV Inspection Flashlight 395-400nm Ultraviolet Spectrum Detects many organic substances like pet stains and blood Water-proof positive-action switch; Barrel-side switch is right where your thumb naturally rests Highly-effective at finding stains, scorpions & bedbugs Verify documents, artwork forgeries/fakes Features 2 settings of 21 and 41 LED; Professional-grade reliable flashlight produces UV wavelength of 395-400 nanometer