TEST PINS FOR BANKNOTES; Know if your banknotes are real. Useful for checking larger billsEASY TO USE; Just mark a on the note. If the appearance is real, your will appear bright yellow. If the banknote is or suspicious, the mark will be displayed in dark brown / black.NO PERMANENT INK; Don't worry about the blemish on your banknote as your marks will go away after 24 hoursperfect FOR; Professional retail environments and businesses such as gas stations, kiosks, corner shops, cafes and pubs if you are mainly dealing in cash and receiving multiple banknotes for verificationSUITABLE FOR DIFFERENT CURRENCIES; Suitable for British pound banknotes, US and ONLY CLEAN MONEY; Millions of are lost to the economy due to money. They can help reduce the amount of money that is put into circulation, thereby mitigating the damage to yourself and the economy.FAST RESULT; No waiting to see if the tested banknoteLOOKS LIKE A BALLPOINT PEN; Our gadgets ordinary pensCHECK YOUR CHANGE; Great for making sure your change is real when paying with cash.WHEN BUYING AND SELLING; Our detection pens offer you protection from opportunists who are difficult to find again. perfect for use in smaller shopsColour:Photo ColorMaterial:ABSSize:13.5 x 0.7cmPackage Contents:2 x banknote checking pensOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.