US Patent 9103668 Laser generated measuring device

The present invention relates to a laser-based measuring device which can be used to measure geometrical sizes and lines of a plane from a distance away. The device comprises a hand-held or mountable housing unit containing a laser projector, two pivotally fixed mirrors moveable by a first and second motor respectively, and at least one range finder, wherein the laser generates a visible line whose width is determined by the on time of the laser the angle of reflection of the first mirror and the rotational speed of the second mirror. The range finder(s) project the laser beam through a marked lens which then illuminate a ruled line or grid upon the planar surface to be measured.