A technique is disclosed for determining capacitive, inductive, and resistive components of power line impedance. The light receiver is coupled to a moving machine part such that it runs ahead of a front edge of the machine part during the operational movement. The method further includes displaying search results associated with each of the preferred categories which have matching criteria based on the conducted search. Use of multiple layers of decorative film, clear plastic and coloredopaque plastic is also disclosed to provide distinguishing visual effects.