3in1, invisible ink, Money checker and Emergency Light
This 5" fine point marker, is loaded with special ink that is only visible under UV light.
It includes a mini LED UV black light with batteries, so you can view your messages.
Kids love them for writing secret messages & notes to each other, students can highlight text books and still sell the book when they finish their coursework.
You can mark your personal property with your house number and zip code in case of theft.
Good Quality Product