Patent ID: 7069662

Claim:
A power tool leveling device, comprising: a housing, an air filled cavity in said housing; a rotating member fixed for rotation about a point in said housing, said rotating member moving in said cavity such that said rotating member seeks an equilibrium position which corresponds to a level position; at least one aperture in said rotating member for enabling passage of a light beam through said rotating member, said at least one aperture or any further apertures all being positioned at a single fixed radius from said point in said housing on said rotating member enabling said light beam to pass through said rotating member at a fixed location; an electrical circuit including an emitting device, a receiving device, and an indicator device electrically coupled such that upon activation, said emitting device emits a light beam which passes through said at least one aperture, said light beam received by said receiving device which, in turn, activates said indicator device indicating to a user that said leveling device is in or near an equilibrium position; and a power source coupled with said electrical circuit for energizing said electrical circuit.