Rulers

For the Trade

What you pick usually comes down to the job in front of you: short marking, longer runs, or a straight edge that will take a bit of abuse. If it lives in a toolbox, metal rulers usually make more sense than plastic rulers because the cheaper ones are the first to go out of true after a few knocks. For quick metric work, a 30cm ruler is still the handiest size. On bigger sheets or when you are setting out, a 1 metre ruler saves you moving it about. Imperial rulers only matter if the job is still being measured that way.

Ruler Types and Layouts

Start with the job length and the scale you work to. A 30cm ruler suits short marking and quick checks, so you can keep it close without getting in the way. A 1 metre ruler gives you a longer straight run and cuts down on resets.

Metric rulers suit most site work because the reading stays simple. Metric and imperial rulers earn their place where drawings or stock still mix both systems. Metal rulers stand up better when the edge gets knocked about. Plastic rulers are lighter and fine when the ruler does not need to take much abuse. If you want the full range, start at Measuring Tools.

What to Check Before You Buy

The main decision is what the ruler has to do in your hands, not just what it measures. Steel rulers and stainless steel rulers are usually the pick when you want a firmer face that stands up to daily use, especially where the edge gets knocked about in the toolbox. The trade-off is weight, and you notice it if you carry one all day.

Aluminium rulers are easier to handle over longer lengths. Plastic rulers suit lighter work and are less of a worry when the piece only gets occasional use.

If you are moving between marking and checking angles, Angle Finders or Laser Levels may be the better spend.

Useful Alongside Rulers

Once you’ve picked the ruler, the next call is what it’s going up against. If you’re marking to finished edges or cutting lines, a straight edge ruler with a clean, hard face matters more than a general-purpose one. A nicked edge gives you a bad line.

For longer runs, a 1 metre ruler saves you joining up marks. A 30cm ruler is handier when space is tight and you’re working off a bench or template. Keep a couple in the kit - one for rough site use, one you trust for cleaner marking. The one that’s been dragged through the van is usually the one that causes the problem.