Nearly invisible in ordinary light, Glo Germ™ (fluorescent plastic particles) glow under UV light. Used as a graphic illustration to show where bacteria can hide, the Glo Germ™ powder and oil reveal areas most often missed in hand washing. Can be used to demonstrate cross contamination and surface cleaning. Kit includes a hand-held 21 LED ultraviolet flashlight (requires three AA batteries, included), an 8-oz. bottle of Glo Germ™ oil (approx. 75-100 demos), a 1.9-oz. bottle of Glo Germ™ powder (approx. 75-100 demos), and a translucent plastic case.