Protractor and 45° Set Square in One

A 45-45-90 set square with a full 0–180° protractor engraved into it and a centimetre rule up both legs — one flat part that replaces three things in a pencil case. The protractor is a real scale, not decoration. Ticks every 5°, longer ticks every 10°, longest at 0, 90 and 180, and numbers every 30°. The numbers are set radially, the way they are on a proper protractor, so they never crowd each other or run off the edge no matter where they fall on the arc. A notch on the base edge marks the pr…

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