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I have used this product many times. It works perfectly as far as I can tell. I even tested it on a fake bill that the company I work for received the day before we received these pens. It immediately marked the fake bill as black. We were so impressed by the speed and accuracy of these pens, we bought more so that all of the employees could have one.
Verified purchase: Yes | Condition: Pre-owned
I like it ,very easy to check the money bill and pretty fast too
Verified purchase: Yes | Condition: New
Exactly what I wanted. Yellow means real money if it turns brown it's fake. I tried on notebook paper it turned brown.
Verified purchase: Yes | Condition: New
Just in time. I sell a lot of things at the flea market and this couldn't have come at a better time that the holidays. Busted 2 fake $50 dollar bills and it's nice to have that security!
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
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