Technical Description: A ruler is a simple measuring instrument used to determine length, draw straight lines, and guide cutting or marking tasks in construction, engineering, drafting, and general workshop applications. It is typically manufactured from materials such as stainless steel, aluminum, wood, or durable plastic, depending on accuracy requirements and working environment. Rulers are marked with standardized measurement scales such as millimeters (mm), centimeters (cm), and inches, ensuring precise and consistent measurements. Some rulers may include additional features such as conversion scales, anti-slip edges, or transparent bodies for improved visibility during drawing and alignment tasks.

Operation: To operate a ruler, place it flat on the surface of the material to be measured, ensuring proper alignment with the starting point (zero mark). Read the measurement at the endpoint of the object by carefully observing the scale markings to avoid parallax error. For drawing straight lines, hold the ruler firmly in place and run a pencil, pen, or marking tool along its edge. In cutting applications, the ruler is used as a guide to ensure accurate and straight cuts. After use, the ruler should be cleaned, stored in a dry place, and protected from bending or damage to maintain measurement accuracy and long-term usability.