The Staedtler Scale Ruler is perfect if you're doing technical drawings or other work where you need to measure and create using ratios

• Manufactured with an engraving process: Dividings and figures have the same accuracy as the die; Dividings and figures are sharper and deeper, and are therefore permanent; Line thickness of dividing are controlled to give maximum clarity
• Tough, flexible, climatically stable and will not discolour or become brittle with age
• Anti-glare finish makes the scales easy to read
• Impact-resistant plastic package
• Clear so you can see your paper through the ruler
• Divisions: 1:1, 1:100, 1:20 and 1:200 (Front), 1:25, 1:250, 1:50 and 1:500 (Back)