A black and white photograph of a circular object with a diameter of 20 mm. The object appears to be made up of a series of concentric circles, with the outermost circle being the largest and the innermost being the smallest. The circles are arranged in a radial pattern, creating a sense of depth and dimension. On the right side of the image, there is a white line that extends from the top right corner to the bottom left corner, indicating the distance between the object and the surrounding area. The line is labeled "3A" and is likely a reference point for the object's size. taken from a distance, as indicated by the "20 mm" label on the bottom right corner.
User kianll uploaded the image
User kianll uploaded the image
