Abstract: A combination tool (20) includes a housing (22) and a laser device (32) rotatably mounted on the housing (22) for projecting a laser line used for aligning and for projecting a laser beam used for aiming, a sonic device (36) coupled with the housing (22) for measuring distances between the tool and a spaced object, a sensor coupled with the housing for sensing objects hidden behind a surface, and a bracket attachable to the housing, the bracket having a first position in which the housing is free to move over the surface and a second position in which the housing is secured in place over the surface.

Abstract: A self-contained line generating device uses a laser diode and a lens to project a fan-shaped beam of visible light. The lens is useful for receiving light and transmitting light in an asymmetrical planar beam. The light is useful for aligning object in a vertical or a horizontal line. The generator also includes a substantially flat face and leveling devices for leveling and orienting the generator onto a flat surface. Retractable pins enable a user to easily mount the line generator onto a wall and align objects.

Abstract: A rotary saw blade for cutting fiber cement board materials. In one embodiment, a rotary saw blade is provided having a main body plate and a central opening with respect to an axis of rotation. A plurality of cutting teeth are disposed about the periphery of the plate. Arcuate tooth support portions extend rearwardly from the cutting teeth and have a center of curvature offset from the axis of rotation. Peaked shoulders having a forwardly sloping portion, a peak and a rearwardly sloping portion extend from the tooth support portions. The peaked shoulders partially define hook-shaped gullets between the shoulders and the cutting teeth.