Abstract: A laser beam level which comprises a base, a support structure and a laser beam emitting assembly, the emitting assembly including a device for emitting a laser beam in a vertical Z plane and the emitting assembly being mounted in the support structure such that it is pivotable in both the X and Y horizontal planes. The base includes a concave depression having a spherical member mounted therein along with an electrical contact member such that when the base is tilted with respect to a horizontal plane, the spherical member will contact the electrical contact to complete an electric circuit between the base and electrical contact member.

Abstract: A laser beam device to perform sightings and tracings which makes use of a calibrated tube inside which resides a laser emitting component of which the optical emitting axis coincides with the mechanical axis of the tube, a mirror securely mounted at the end of the tube and set at a 45.degree. angle from the incident laser beam, an end piece mounted and rotating on the end of the tube which includes a number of ports which can be brought to be coaxially centered in the reflected beam by simply rotating the end piece and a number of optical systems respectively mounted in the ports. The device provides flexibility without requiring additional set-up.