A stainless steel ruler graduated in both millimeters (mm) and inches is a precision tool used for accurate measurements in various fields, including engineering, drafting, and general office use. Typically made of durable stainless steel, these rulers feature clear, easy-to-read graduations on both sides, with millimeter and inch markings. They offer durability, corrosion resistance, and a professional finish, making them ideal for precision tasks. Available in various lengths (e.g., 6", 12", 30cm), they are commonly used in workshops, schools, and laboratories.