Buttons are not large, so the diameter is harder to measure. Then, how to measure the diameter of the button? Below China Button Industry Network will give you a description of the button diameter measurement method, hoping to bring you convenience and help. If you have a vernier, you can measure it directly. If you don't have a vernier, you can place the button flat on the desktop, put a ruler at the bottom of the button, put a ruler to the right and left, vertical to the ruler at the bottom of the button, you can directly at the bottom of the ruler If you read the data and the ruler is not enough, the left and right rulers can be replaced by other straight objects. The ruler is perpendicular to the lower end of the ruler. The above is about the measurement method of the button diameter. I believe you already know how to measure the diameter of the button. Want to learn more about buttons: accessible Reading Glasses,Bifocal Reading Glasses,Plastic Reading Glasses,Vintage Reading Glasses Wenzhou 101 optical Co. Ltd , https://www.101optical.com