Features: Ruler length 30cm/12''; 1:20, 1:25, 1:50, 1:75, 1:100, 1:125/ 1:100, 1:200, 1:25. 0, 1:300, 1:400, 1:500 You donot have to waste time figurings out to measure eachsteps; scale arelabeled in 2ways to be easily read from right to left and left to right. The lightweight plastic materials ensures convenience and ease of use for professional who require accurate measurements and scale drawing. Suitable for architects, engineers, and students, this scale ruler to assist with precise measurements and drawing. Whether you're working on architectural designs, engineering projects,and even model making, this scale ruler ensures accuracy and reliability. With its metric scale and user friendly designs, the plastic triangular scale ruler is excellent choice for those in need of precise measurements and drawing. Specifications: Material:Plastic Scale: 1:20 1:25 1:50 1:75 1:100 1:125 / 1:100 1:200 1:250 1:300 1:400 1:500 Type:71130,71130B,:61130,61130B Package Includes: 1x Scale Ruler note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.