Bright Uv Blacklight Invisible Ink Spy Pen Ultraviolet PLUS FREE BONUS: add'l set of Batteries
THIS 2 IN 1 PEN IS PERFECT FOR KEEPING INVENTORY OR PLACING INVISIBLE SERIAL NUMBERS ON ALL ITEMS-YES EVEN GLASS (SAMPLES SHOWN ARE ON GLASS)THIS PEN IS AFFORDABLE ENOUGH FOR KIDS WHO JUST LOVE IT FOR PLAYING PRIVATE EYE AND BOY DO THEY AMAZE THE KIDS AT SCHOOLFREE BONUS: Will include an additional set of button batteries!!!