It is much easier to use laser appliances when working laser appliances, such as builders of planes than a ruler and markers. The need for drawing on the walls of the lines disappears, they are drawn by the builder of the laser planes: on the wall you can see a laser line, and glue wallpaper or lay out tiles on it. To do this, only put the device and turn on. For example, when asphalting, you can fix the builder on a tripod, and the contractor does not have to stand near him.