A laser level is a level that uses a laser beam instead of manual reading. The laser beam emitted by the laser is introduced into the telescope tube so that it emits a horizontal laser beam along the sighting axis.
Using the monochromaticity and coherence of the laser, a glass or metal sheet with a certain shading pattern, i.e., a zone plate, can be installed in front of the telescope objective to cause diffraction interference. After the telescope is focused, a bright and fine cross-shaped or circular laser spot is obtained within the focusing range of the zone plate, so that the target can be aimed more accurately. If the front and rear leveling scales are equipped with photoelectric receiving targets that can be automatically tracked, leveling measurements can be performed. In construction measurement and assembly of large components, laser levels are often used to establish horizontal planes or horizontal lines.
