Laser level
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A laser level emits a straight laser beam, usually a flat plane of light. This can then be mounted on a tripod or surface and used as a guide during construction. A common use of this tool is in the levelling of land, ensuring a consistency across a surface.
Some have said that this is essentially a modern version of using a taut string tied between stakes, and of the pantheon of construction equipment may be considered a tool of moderate worthiness.