Invisible Ink Pen,Light Pen,UV Light Pen,UV Pen

The pen is made of plastic and the pen' ink is made of special high-brightness compounds that are invisible to the naked eye, but magically illuminate when exposed to the attached ultraviolet (UV) light. Feature: 1) marking your belongings in case they're stolen, 2) keeping your computer passwords secure, 3) sending secret notes, 4) making "special" diary notations, 5) recording pin numbers and access codes