What is the base unit that is divided in an engineering scale?

An engineering scale is based on unit increments of a/n ____.

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Explanation:

The most often used architect's scale is 1/4" = 1'-0". The basic unit of measure for metric scales is the millimeter (mm). Drafting scales are either open-divided or full-divided.

I really have no clue if this is right or not because, well, I'm not an expert.

If this is wrong, don't hesitate to report my answer if it's wrong.