Nearly invisible in ordinary light, Glo Germ⃜ (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 9 LED ultraviolet flashlight, 8 oz. bottle of Glo Germ™ oil, 1.9 oz. bottle of Glo Germ™ powder (both good for approximately 75-100 demos), and three AA batteries. Comes in a translucent plastic case.