Surface plate

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, marking out (layout), and tooling setup. The surface plate is often used as the baseline for all measurements to a workpiece; therefore, one primary surface is finished extremely flat.

Excerpt from the Wikipedia article “Surface plate”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Rrudzik, CC0, via Wikimedia Commons.