a wear sensor comprising : an insulating substrate having a top surface and a bottom surface ; a conductive electrode formed on said top surface of said insulating substrate ; an insulating wear lining material having a first side secured to said top surface of said insulating substrate and conductive electrode , an opposite second side that will be worn down by relative motion between the wear sensor and a moving component ; and one or more contact points where the electrical properties between the electrode and the moving component can be measured .