Scale rules in all popular graduations in brands such as Draftex Staedtler, Rotrina and Kent are all stocked. The oval section scales conform to AS1212 standards and feature colour coding to help identify the model. Each oval section scale has two graduations per edge making a total of 8 per ruler. This compares to 6 on a triangular scale as all but the Rotring models have one graduation per edge.
Roller rules offer an economical way of drwing and measuring a parallel line.
Map Measures are often used to estimate quantities by being used to measure off sections of drawings. The digital model can bet set to a variety of scales to match the drawing being measured.