Dri Mark Smart Money Counterfeit Detector Pen with Reusable UV LED Light

Not very good. Seems to only work on US paper.

I used to use these at a bar I worked at. The pen is always nice, but having the UV LED light for super quick bill checking is a really nice feature. You'll see the bands glow and the watermark illuminate. I've seen bills that were clearly hand drawn so that they would look reasonably good when held up to the light, but become VERY obviously fake once hit with the black light. I ended up buying these for home use once I started selling some of my gear on Craigslist. There are a lot of counterfeit bills floating around there, and I didn't want to get scammed. The cost of these pens is a small price to pay. I guess it's hard to say how "accurate" they are. There might be counterfeits out there that are good enough to fool both the pen AND the UV LED, but at that point I'm not sure that any other measure is going to be much better.

Easy to use. We checked all large bills at our garage sale and fortunately no one tried to pass a counterfeit bill. Proof- money from the garage sale was taken to our bank & there were no issue.

works great I use it for my cash handling at work ,

WITH PEOPLE BLEACHING ONES, AND SUPERIMPOSING IMAGES OF 10, 20, 50 DOLLAR BILLS ON THEM, IT HELPS TO HAVE THE LIGHT ALSO--TO FIND THE WATERMARKS