Is intentional, you

In construction, first of all, with the help of levels, they check the correctness and horizontality of the foundation. Using these devices, the alignment of ceilings, walls, and floors control. The setting process is described in detail in the instructions. If the level is intentional, you can choose the direction of the beam, as well as two at once. When checking the doorway, only a vertical axis is enough, others can be turned off, thus the energy consumption is reduced.