Abstract: A base for a light generating device or a leveling device, having a first surface that includes a connection structure to receive and mount either a light generating device or a leveling device thereto, and a second surface including a nonmechanical attachment structure.

Abstract: A device and method for a straightedge with a handle and a level are provided. The device includes a rectangular body having at least one flat edge surface; a handle adapted to engage the rectangular body; and at least one leveling vial mounted to the handle. The vial indicates whether the at least one flat edge surface of the rectangular body is level against a planar surface when the handle is engaged with the rectangular body. The method of leveling or measuring includes the steps of providing a rectangular body having at least one flat edge surface, providing a handle adapted to fit with the rectangular body, the handle having at least one leveling vial mounted thereto, and removably engaging the body to the handle.

Abstract: A line generating device comprising a housing with a support structure that substantially extends along a first plane, a light source mounted within the housing, and a lens that receives light and projects the light in the shape of a fan, wherein the fan lies substantially within a second plane that intersects the first plane at an angle. The device also includes at least one reference level on an outside of the housing.