☼If the light turns to green , which neans the lens is the Anti-radiation lens You will be able to show your customers the result and might help you to sell your product effectively ☼Using the UV testing light on this detector , you will be able to tell if the lens can block out UV rays easily It is for you to explain to our customers by showing the result ☼Anti-UV optical lens detector & Anti-UV rays shading monitor & Anti-Radiation monitor ☼Three big lights , the high-precision electronic components ☼ There are two black buttons on the upper right corner , with a normal lens , you will see Anti-UV display light to turn to red when you place the lens on the Anti-UV testing positon, Manufacturer: Watreketal