Image Number 3 for United States Patent #6996910.
A laser leveling device includes a laser instrument having a base rotatably received in a cavity of a housing and having a light emitting device to generate a light beam, such as a line-shaped light beam. One or more batteries may be used to energize the light emitting device. The light beam generated by the light emitting device may be rotated relative to the housing when the light emitting device of the laser instrument is rotated relative to the housing. The housing includes two conductors, and the laser instrument includes two terminals to electrically couple to the conductors of the housing when the laser instrument is rotated relative to the housing.