Abstract: A device for determining a mechanical fault in an automotive vehicle by determining mechanical vibrations comparatively between two like points on the vehicle to determine which of two automotive devices is in need of repair or replacement. The device includes two piezoelectric devices operatively secured to a pair of mechanical clamps capable of being attached to two like points on the automotive vehicle.

Abstract: The disclosure relates to a guide rule for aligning and facilitating mounting of a protective side moulding to a side panel of a vehicle, with said side moulding in a substantially straight line orientation. The guide rule includes a continuous elongated strip of flexible magnetic material, preferably of the type having a plurality of magnetized particles embedded in or impregnated in an elastomeric material, said strip being of a first thickness, and an elongated strip of metallic material, preferably spring steel, laminated to the flexible strip. The metallic strip is provided with substantially linear, parallel elongate edges and has a width dimension which is at least equal to the width dimension of the flexible strip, and a thickness substantially less than the thickness of said flexible strip. The magnetized flexible strip provides means for securely attaching the guide rule to an auto side panel, and the metallic strip provides a rigid, rectilinear support surface for the side moulding.