Level

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1. In surveying, an instrument used in combination with an elevation rod to read differences in grade.

johnson-laser-level-99-002k-64_300.jpg

A Self-Leveling Rotary Laser Level System commonly used for surveying, including a laser level.
Source: http://www.homedepot.com/p/Bosch-800-ft-Self-Leveling-Rotary-Laser-Level-Complete-Kit-5-Piece-GRL-240-HVCK/205066779