1+1 free !!! Get 2 banknote tester pen for 1 !!! With special ink revealing fake bank notes, and another side with classic ball pen. ESSENTIAL !!! For all your business with anyone, close to you at the cashier…. You won’t leave this pen anymore !!! Any doubt ? No more doubt ! With this banknote tester pen, cancel error risks or scams. Mark the note, for example, with a cross, in an area wich is lightly coloured and not printed on ; If the marking shows up as bright yellow, your bank note is genuine and therefore valid. If the marking goes dark and stays dark, your bank note is forged ! The marking disappears again after a few hours. Easy to use, this pen is 2in1 with one daily ball point pen side. Just think to replace the cap after use, so that you can use it longer and longer 😉 Effiency tested and approved. Very easy to use. Long life, if you remove the cap after each use.