尺子 (ruler) is a common measuring tool used to determine the length or distance of objects. Typically made of wood, plastic, or metal, it features a straight edge with measurement markings in centimeters and inches. Rulers are essential in various fields, including education, engineering, and construction, helping users achieve accuracy in their work. In addition to standard rulers, there are specialized types, such as T-squares and yardsticks, which serve specific purposes. Rulers can also be found in digital formats, such as apps, that allow users to measure distances on screens. Overall, the尺子 is a fundamental tool for precise measurement.