Button diameter measurement method
With a vernier scale, it can be measured 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 a measure of the diameter of the button. I believe you already know how to measure the diameter of the button.
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