Just press the switch to light up the UV light. After writing with the pen, the ink will not be visible. You need to turn on the purple light on the pen cap to illuminate the writing area to see the writing traces. This UV invisible light pen is made of a new, environmentally friendly plastic material, which is safe and non-toxic. The pen body is humanized, the fiber pen tip writes smoothly and can be easily smeared, and it is easy to use with a switch and button battery. Equipped with an LED electronic purple light, it can be used as a small ultraviolet lighting tool, and it has a banknote detector light, which can easily distinguish the authenticity of RMB. There are many colors to choose from, and it can also be customized.
