2 in 1 fake currency checker and Invisible Ink pen & built-in UV black light- buy 1 get 1 free

2 in 1 fake currency checker and Invisible Ink pen & built-in UV black light
Write the message with this pen, it is completely invisible and no body can see it.
Turn on the UV light on the Lid to See what is written no other person can see it
UV Light pen, mini size
Ideal as a promotion pen, gift pen
Light to check currency notes or other watermarks
Non-toxic and Environmental friendly