Gearbest - Invisible Ink Pen with UV light $0.99 Delivered (code)

Excellent under $1 deal!

It writes with invisible ink made of special high-brightness ultraviolet viable compounds. This means the ink is completely invisible under normal light! Once the message has been written in invisible ink, it is time for the blacklight.

Main Features:
● You can use it to make a joke with your friends, that will be interesting
● Powered by 3 x AG3 button batteries (included)