1.The unique ink in the Detector Pen identifies notes quickly &amp;amp; easily.<br />2.Genuine currency: light yellow or clear color mark<br />3.Suspect currency:Brown or Dark mark appears<br />4.Color：Blue ，black<br />5. Ideal for testify Bank Notes. These Pens is applied to a suspect Note， which use good ink. when applied to genuine note the ink the color will be dim yellow or clear， however a Fake Note will turn Black/Brown. <br />6. Works on international paper including:Arjantin Peso，Brezilya Cruziro，ingiltere Pound，Fransa Euro，Almanya Euro，HongKong Dolar，Italya Euro，Japon Yen，Kore Won，ao Dolar，Malaya Dolar，Yeni Zelanda Dolar，Rusya Ruble，Guney Afrika Rand，Ispanya Peseta，Tayvan NT Dolar，Tayland Baht，A.B.D Dolar.<br /><br />Package include<br />1 x Banknote tester pen