Patent ID: 8132334

Claim:
A rotating construction laser comprising: a laser core module including: a laser unit for emitting a laser beam and rotation means for rotating the laser beam around an axis of rotation thus defining a laser beam plane; an outer pivoting mechanism attached to the laser core module, the outer pivoting mechanism being operable to tilt the laser core module around an X-axis as a first axis of rotation and around a Y-axis as a second axis of rotation; and a dual grade mechanism including a first level sensor operable to indicate a rotation of the laser core module around the X-axis and a second level sensor operable to indicate a rotation of the laser core module around the Y-axis, the first and the second level sensors being designed to detect balance with respect to gravity, wherein: the first level sensor and the second level sensor are individually attached to the laser core module; the first level sensor is rotatable around a third axis of rotation; the second level sensor is rotatable around a fourth axis of rotation; and a rotation of the first and second level sensor around the related third and fourth axis of rotation is mutually independent.