Typical consumer laser line level using spirit levels for three planes and including a digital stud sensor display. A laser line level is a tool combining a spirit level and/or pendulum with a laser to indicate a levelled line against a surface.
Handheld laser line levels are used in surveying, construction and cabinetry industries.
In surveying, a laser is affixed to a tripod, levelled and then spun to create a horizontal plane. "The laser beam projector employs a rotating head for sweeping the beam in a horizontal plane, with visually readable level vials and manually adjustable screws being provided for orienting the projector in a level attitude so that the beam plane is level."
References
- Rando, et al. "System for controlling attitude of laser beam plane." US Patent 4,062,634 (http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/search-bool.html&r=1&f=G&l=50&co1=AND&d=ptxt&s1=4062634.WKU.&OS=PN/4062634&RS=PN/4062634), December 13, 1977.
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