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  2. The 7 Best Laser Levels of 2023, Tested and Reviewed - AOL

    www.aol.com/lifestyle/7-best-laser-levels-2023...

    Our top pick is the Tavool Self Leveling Laser Level, which our testers loved for its high level of accuracy, shockproof make, and affordable price, among other features. Tavool...

  3. The best laser levels for DIY and construction in 2022 - AOL

    www.aol.com/news/best-laser-levels-diy...

    Axis: 4 | Range: 360˚ x 4 | Laser type: Green | Detector Range: 50m / 165ft | Accuracy: 2mm @ 10m | Magnetic base: Yes | Self-levelling limit: 3˚ | Manual mode: Y | Protection: IP54 |...

  4. Laser level - Wikipedia

    en.wikipedia.org/wiki/Laser_level

    A rotary laser level set up and used to level sand fill in trenches. The graduated staff is leaning on the pile of sand. In surveying and construction, the laser level is a control tool consisting of a rotating laser beam projector that can be affixed to a tripod. The tool is leveled according to the accuracy of the device and projects a fixed ...

  5. Level (optical instrument) - Wikipedia

    en.wikipedia.org/wiki/Level_(optical_instrument)

    A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks. It is widely used in surveying and construction to measure height differences ...

  6. Levelling - Wikipedia

    en.wikipedia.org/wiki/Levelling

    Levelling or leveling ( American English; see spelling differences) is a branch of surveying, the object of which is to establish or verify or measure the height of specified points relative to a datum. It is widely used in geodesy and cartography to measure vertical position with respect to a vertical datum, and in construction to measure ...

  7. Nitrogen laser - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_laser

    The nitrogen laser is a three-level laser. In contrast to more typical four-level lasers, the upper laser level of nitrogen is directly pumped, imposing no speed limits on the pump. Pumping is normally provided by direct electron impact; the electrons must have sufficient energy, or they will fail to excite the upper laser level.

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