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  2. Laser level - Wikipedia

    en.wikipedia.org/wiki/Laser_level

    A rotary laser level is a more advanced laser level in that it spins the beam of light fast enough to give the effect of a complete 360 degree horizontal or vertical plane, thus illuminating not just a fixed line, but a horizontal plane. [5]

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

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

    Line everything up perfectly, with the best laser levels available today. ... Beyond 4-degrees and the internal pendulum will lock for protection, meaning the lines can be used for angles too. The ...

  4. Spirit level - Wikipedia

    en.wikipedia.org/wiki/Spirit_level

    The device was unique in that it could be placed on a machine bed and show tilt on the x-y axes simultaneously, eliminating the need to rotate the level 90 degrees. The level was so accurate it was restricted from export during World War II. The device set a new standard of .0005 inches per foot resolution (five ten thousands per foot or five ...

  5. M squared - Wikipedia

    en.wikipedia.org/wiki/M_squared

    In laser science, the parameter M 2, also known as the beam propagation ratio or beam quality factor is a measure of laser beam quality. It represents the degree of variation of a beam from an ideal Gaussian beam. [1] It is calculated from the ratio of the beam parameter product (BPP) of the beam to that of a Gaussian beam with the same wavelength.

  6. Level Up Your DIY Projects With These Editor-Approved Laser ...

    www.aol.com/lifestyle/keep-home-diy-projects...

    Mounting new kitchen cabinets or hanging a few pictures? Keep your stuff level and straight with these tried-and-tested gadgets.

  7. Square (tool) - Wikipedia

    en.wikipedia.org/wiki/Square_(tool)

    T-square, or glazier's square, [1] or drywall square. [26] A T-square is a style of square where the blade is fixed onto on into the middle of the stock, forming a 'T' shape. The most common type of T-square is a guide for drawing horizontal lines on a drawing board, and can guide a set square to draw vertical or diagonal lines. [27]

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