Spy Labs | Invisible Ink Pen and UV Light
$21.00
Exchange top secret info with your friends and fellow agents using this high-tech device. The pen uses a special ink that only becomes visible under ultraviolet light, like the one emitted by the flashlight on its opposite end.
You can also use the UV light to find other objects and materials that glow.
You will need: small phillips-head screwdriver and 1 AAA battery.
Thames & Kosmos
Ages 8+