
The image shows a display case with a wooden ruler on top of it. The ruler is rectangular in shape and has multiple lines and markings on it. There is a piece of paper on the top right corner of the ruler with some text written on it, which appears to be instructions or instructions. The paper is white with black text and is placed on a wooden board. The display case is made of glass and is located in a museum or exhibition space. In the background, there are other items on display, including a red and white sign with numbers and letters.
