Rotary lasers are invaluable when it comes to creating reference lines on all four walls of a building. They are able to do this because these lasers project 360 degrees, giving you reference lines on the ceiling, floor and both walls. This comes in handy when needing to align components on each wall at a certain height. The rotating lasers that we offer are accurate even in large rooms because of their large effective ranges. Always remember that when using any normal laser outside you will not get the same kind of long range beams that you get inside unless the laser is designated for outside use.