Have you ever received a $100 bill and wondered whether it is authentic? Fake money is not always easy to identify. The Dri-Mark Smart Money Counterfeit Detector Pen can help you out. This pen and UV counterfeit detector system exposes counterfeit currency at the point of sale. Simply make a small mark on any currency bill and the chemically sensitive ink does the rest. A dark brown or black mark means the bill is suspect.
For $5 through $100 bills printed after 1996, you can use the UV light in the pen cap to see the security thread. This system is simple to use and keeps you safe from accepting counterfeit money. It is pretty cheap too.