A system and method are disclosed for conserving power during navigation, e. The system includes a hand-held device having a bar code reader or other unique means of entering a product identifier, and a display mechanism. A compression and torsion spring serves to bias the conductive elements apart to bias the electrode to a forward position, and to apply a torsional load to the mating structures to maintain their sidewalls in contact. Respectively one of the filtered partial discharge signals is assigned, respectively, to one of the n filters, n being greater than or equal to two. One aspect of the method comprises sending an actuation signal to a switch, receiving a vibration signal associated with the switch, and determining from the vibration signal whether the actuation occurred.