dri-mark 3513b1 - smart money counterfeit bill detector pen for use w u.s. currency 3 pack
highly effective and inexpensive tool for detecting bad bills . simply make a small mark on u.s. currency . chemically sensitive ink works instantly . an amber mark passes the test while a dark brown or black mark means the bill is probably counterfeit . works on all new design u.s. currency bills series 1959 and later . counterfeit bill detector type pen marking color amber counterfeit indication mark black dark brown currency u.s.