Write with the invisible ink pen then light your message with the mini black light to see what was written. Invisible pen brings you an amazing variety of fun applications: Secret messages, emergency flashlight, security marking.
Can be used as a money detector pen.
Have battery cabin and screw in order to prevent children put battery into mouth
Any color of barrel is available
Class 1 UV light, 395 - 400nm
ABS plastic
USA import ink