Did you ever try to pass super-secret coded messages to your best friend in school, just to get caught by the teacher? It's too bad these handy-dandy tools weren't around back in the day.
UV Spy Pen
This is not your ordinary, run-of-the-mill boring pen. This little writing tool is just "write" for spies-in-training.
What makes this pen perfect for the super-sleuth in your family, is the special ink inside. The special ink is invisible to the naked eye. It's made out of high-brightness compounds that show up when exposed to an ultraviolet light source. And don't worry - you don't need to run out and buy a brand new blacklight. There is an actual blacklight embedded into the pen itself. How cool is that? Just flip the pen over and shine the light on the secret message. Watch as the words magically appear before your eyes.
Now you can pass all sorts of secret messages and notes to friends and family without having to come up with your own super secret code. Just write it down with your new UV Spy Pen.
The pen is 5 inches long and uses four LR41 watch batteries, which are included. The product retails for under $10 and is recommended for children 5 and above.
Source and Photos: Perpetual Kid and Physlink