Automatic laser levels, or self-leveling levels, have become a much more common optical instrument on construction sites. These levels are replacing alternatives, such as builder's levels, because they are easier to use and quicker to set up.
Automatic laser levels remain level and accurate no matter how much the ground vibrates, how much the temperature changes, and how unsteady the operator handles it.
Instead of having the traditional graduated leveling vials like the transit level or builder's level, automatic laser levels have a circular level.
The circular level, or bulls-eye level, is mounted on the automatic level and is centered to facilitate the leveling. Once the bubble in the circular level is centered, a compensator takes over and maintains a true level line of sight.
This provides a very convenient set up; once the instrument is level, no further leveling is required at the location.
Automatic laser levels are useful in many different situations.
Verifying elevations of foundations, footings and walls.
Establishing proper drainage for structures.
Determining the correct elevation for floors.
Establishing the height of doors and windows.
Developing suspended ceilings.
Parts of an Automatic Laser Level
The basic setup of an automatic level consists of the telescope, the circular level, three leveling screws, and a compensator. However, there are plenty more parts that play a key role in the success of the automatic level. (Insert a diagram locating specified parts)
Telescope - holds lenses that magnify objects in the sight.
Focusing Knob - can be turned to make objects appear crisp and clear.
Objective Lens - catches the object being sighted and magnifies the object.
Graduated Horizontal Circle - marked by degrees, used for setting and reading horizontal angles.
Leveling Screws - allows adjustments to be made to ensure the instrument is level.
Base Plate - area that the automatic level attaches to on the tripod.
Horizontal Tangent Screw - can be adjusted to make the instrument move left or right on the horizontal plate.
Circular Level - mounted on the automatic level, this ensures that the instrument is at a true level point.
Eyepiece - located at the viewing end of the telescope, it can be turned to bring the crosshairs into focus