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Scale Rulers, Metal Rulers & T Squares

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Questions we get asked

How do I read a scale ruler?

Pick the edge marked with your drawing's scale and measure with it as normal: the numbers give you the real-life size. At 1:100, for example, 1cm on the drawing stands for 1m in real life.

Triangular or flat scale ruler?

A triangular scale ruler fits more scales onto one rule and is easy to pick up off the desk. A flat scale ruler has fewer scales but lies flat and slips into a pencil case or folder.

Which ruler should I cut against?

A metal one. A knife can bite into a plastic ruler and drift off the line. A rule with a raised edge keeps your fingers further from the blade.

What is a T square used for?

Drawing parallel horizontal lines. Hold the head against the straight edge of a drawing board or table and slide it up and down, then rest set squares on it for verticals and angles.

What does a deckle edge ruler do?

It tears paper along a serrated edge instead of cutting it, giving a rough, handmade-looking edge. It's popular for watercolour paper and handmade cards.

Goes well with