Measuring & Marking

Marking Gauge

The tool that puts a knife line exactly parallel to a face. Better than a pencil for joinery because the knife severs fibres and the saw follows the wall.

Measure stage

Specification

Capacity	up to 150 mm
Body	Beech with brass wear strip
Pin	Hardened steel, wedge lock
Stem	Ground square, 6 × 24 mm
Adjustment	Brass thumbscrew
Weight	180 g

What it is for

The tool that puts a knife line exactly parallel to a face. Better than a pencil for joinery because the knife severs fibres and the saw follows the wall. This guide covers what the tool does, the specification points that actually change your results, and how to use it without damaging the work or yourself.

Where it fits in the build

This is a measure stage tool in the Measuring & Marking category. Lay out accurate parts before any cut is made.

Measure Measuring & Marking

Using it well

Set the gauge with a rule, then lock it and test the setting on scrap every time.
Hold the fence flat against the reference face and tilt the gauge slightly away from you — the pin then rides in the cut it made.
A knife line gives a cleaner shoulder than graphite; use it wherever the joint will be visible.

Compatible materials

Materials this tool handles without compromise. Where a material is not listed, check that the tool is rated for it before committing to a cut.

Hardwood
Softwood

Reference sample in 3D

The model above is a real cherry reference block rendered in the browser. It is simulated from a height field rather than photographed, so you can rotate it to see how light behaves across the grain, the end grain and the edges. Drag it, or use the view buttons to look at the top face or the end grain in isolation.

Why this matters

Reading how light falls across a board is the fastest way to judge whether a surface is flat. That is the same judgement you make with a hand plane or a sander, and it is much easier to see on a rotating model than on a static photo.

Educational content only. Settings, capacities and safety guidance here are general starting points, not instructions for your specific tool, material or situation. Always follow your tool manufacturer's manual and any material datasheet, and check your own measurements before cutting.

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