See What the Naked Eye Cannot See with Portable Ultraviolet Lights
Portable Ultraviolet Lights make the invisible visible for prospectors, gemologists, sanitation inspectors and criminologists. Lghtweight lamps feature a built-in handle that opens to form a stand and 360° rotation. Each has a lamp area of 1" x 1" and 4W of UV power. These Ultraviolet Lamps weigh just 1/2 lb. and include a 60-page guide: The Story of Fluorescence. Four AA Alkaline Batteries, No. 9875, sold separately, provide up to four hours of use.
Longwave UV Light has a spectrum of 330-400 nm.
Shortwave / Longwave Combination UV Light contains a single double-ended bulb, with Shortwave and Longwave at opposite ends. Spectrum: Shortwave 254nm, Longwave 330–400nm.