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dumpy level

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optical instrument used to establish or check points in the same horizontal plane

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Bundesarchiv Bild 183-K0701-0001-003, Talsperre Gottleuba, Bauarbeiter mit Nivelliergerät.jpg
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Surveying levels
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Modern automatic level in use on a construction site

A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks. It is widely used in surveying and construction to measure height differences and to transfer, measure, and set heights of known objects or marks.

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