This Staedtler Reduction Scale Ruler is a great tool when you're doing technical drawings. It allows you to create accurate lines at an appropriate and consistent scale.

• The ruler itself is 30 cm long so you can easily keep it handy.
• It allows you to create at scales of 1:20, 1:25, 1:33, 1:50, 1:75 and 1:100.
• It has a durable plastic construction to withstand frequent use.