G26096 ^ Radioactive Vaseline Glass Marble UV LED & Battery

Radioactive (can be detected by a Geiger Counter with SBM-20 tube) Vaseline glass marble is a light grey/green with swirls visible. As soon as you light it up with the included battery/UV LED it glows a bright yellow green. Marble is about 0.6" (15mm) in diameter. Set included radioactive marble, UV LED and CR2032. Just slide LED onto battery (long leads goes to (+) and short to (-), the LED will glow a purple (UV) color.