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Flod logic (talk | contribs) Adding local short description: "Optical instrument to verify horizontal points", overriding Wikidata description "optical instrument used to establish or check points in the same horizontal plane" |
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{{Short description|Optical instrument to verify horizontal points}}
[[File:Us land survey officer.jpg|thumb|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]], and is used in conjunction with a [[levelling staff]] to establish the relative height levels 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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