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“plumb levels”
plumb level (s), plumb levels (pl); plumb rule (s), plumb rules (pl) (noun forms)
A level made up of a piece of hardwood or metal fitted with curved glass vials which are oriented horizontally and vertically in order to the frame.
The vials are filled with liquid, and an air bubble is left to aid in the determination of the horizontal plane and highest vertical point.
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plumb-, plumbo-, plumbi- +
(page 1)