Abstract: A device for use in conjunction with a power tool, such as an electric drill, the device including an elongate housing in place on the drill motor housing. The forward end of the housing telescopically supports a carrier within which is universally mounted a foot member. Electrical contacts within the carrier are contactable by the foot member upon the elongate housing inadvertently being out of a desired perpendicular relationship to a work piece surface. An indicator at the rearward end of the elongate housing provides signal lamps indicating to the tool operator which direction the tool must be moved to re-establish the desired tool-to-work piece perpendicular relationship.