What is a rotary laser
A rotary laser is a device that indicates horizontal or vertical planes or other construction points by means of a continuous 360-degree laser arc. This continuous light is projected onto walls, floors, or other structures to facilitate marking building elevations or aligning various components mounted at the same height. A rotary laser differs from a traditional laser level in that it projects a laser reference in a 360-degree arc. Instead of individual line levels, the reference line can be projected onto all the walls or floors and ceilings of a room simultaneously. Now you know what a rotary laser is, let's learn its advantages and disadvantages.
Vorteile der Verwendung eines Rotationslasers 
The rotary laser is used primarily in commercial construction because it allows the leveling reference to be projected onto any interior surface. This laser reference can be projected horizontally, vertically, or at any preset angle. Although rotary lasers are also useful in the home improvement or DIY sector, their size and cost limit their versatility for home use. A standard single reference laser is more suitable for DIY use.
Another benefit of using a laser level is that the reference line always stays on top of the work surface, making layering structures easier. Rotary lasers have the added benefit of a 360-degree projection arc that covers the entire interior area from a single projection point. This makes marking columns, trim, or other architectural elements that surround more than one wall of a room much easier than using a traditional spirit level. This feature extends to both room levels, adding considerable flexibility and a high degree of accuracy to building measurements.
How to use a rotary laser
Ideally, a rotary laser should be used with a laser level tripod, but any stable and level surface will do. Most units are self-leveling, so setup is not difficult. Typical units also have a warning feature that alerts the user if the unit moves during operation or if the level exceeds the level. Rotary level lasers are available in standard red diode models and a new high-visibility green variant that is easier to see in bright light conditions.
Disadvantage of the rotary laser
The only real downside to a rotary laser is that the device tends to be more expensive than a static laser. Unfortunately, this makes it difficult to purchase a reasonable product for the DIYer. However, it can be an essential piece of hardware in any construction team's arsenal, and the results are far superior to static laser levels and other traditional leveling reference methods.
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