Outus 4 Pieces Counterfeit Bill Detector Marker Pen Counterfeit Money Pen Fake Money Checker Universal False Currency Pen Bills Money Loss Prevention Tester Pocket Size

It worked well.

I could’ve swore I had a $20 bill that was counterfeit but my bank told me they weren’t sure ; they couldn’t find their counterfeit pen so I bought these. The bill was good!

Muy bueno

I got a box of 8 to share with one other person. I took the cap off of each one to be sure they were good. Unfortunately, one of them was dried out and the tip fell off. I'm not going to bother returning the whole box over one bad one, but I would encourage you to check all of them out when you receive them regardless of the number you order. The other seven pens work perfectly on several different denomination bills I've tried them on. I would caution you to just lightly draw a line on the bill. There is no need to press down hard and risk damaging or breaking the tip.

I use these pens when selling items when people pay in cash. Great idea! Great product.

These were the cheapest ones I could find and they worked as they should.

They seem like they will dry out after maybe 6 months of sitting there. I doubt like the quality of the felt used. Seems kind of cheap, but it dudes the job. I marked my $100 bill it was light yellow. I tried on regular paper & it turned black. I just wish these felt like better quality like a sharpie pen.

I like them