A basic prerequisite for machine installation is that the base is flat. It is also a requirement for machine tables, so that manufactured parts then maintain tolerances. Flanges on tower segments for wind turbines are also checked for flatness, but here the requirement can be linked to a desired inclination of the plane (taper).
The laser beam is adjusted according to the vials on the laser transmitter, and the measurement value at the first measurement point is set to zero. The measurement values at the other measurement points will show the deviation from the horizontal plane.