Here is a pen that allows you to write secret messages for others. It is specially fun to play with for kids. The marker is loaded with special ink that is only visible under UV light. The pen also has a mini LED UV light with batteries, so you can view your messages. So the next time you want to leave a secret message for others, you may want to give this pen a try.
[via]
**Disclaimer: Our posts may feature aff links. As an Amazon Associate, we earn from qualifying purchases. Please read our disclaimer on how we fund this site.
