Editing Spirit level (section)

===Line level===
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[[File:Measuring elevation with a line level. Historical archaeology at the old Champoeg townsite, Champoeg, Oregon (USA) 1973 (2149089991) (cropped).jpg|thumb|Measuring elevation with a line level and measuring tape.]]
A line level is a level designed to hang on a builder's string line. The body of the level incorporates small hooks to allow it to attach and hang from the string line. The body is lightweight, so as not to weigh down the string line, it is also small in size as the string line in effect becomes the body; when the level is hung in the center of the string, each 'leg' of the string line extends the level's plane.