Abstract: A precision tool is disclosed herein for locating the center of a workpiece having a shaft detachable coupled to the spindle or chuck of a drill press. Downwardly depending from the shaft is a housing enclosing either an electro-mechanical pendulum or an optical device having a bubble target. A holder is provided for the workpiece so that the workpiece may be positioned until the target lies along the central longitudinal axis of the pendulum or the optical axis whereby the workpiece is centered with respect to the spindle or chuck of the drill press.