Circuits for performing four terminal measurement point testing of devices under test is provided. Conductor layers are linear conductors, and define coils included in the laminated body. A tribological coating is disposed atop at least one of the rotor face and the stator face, which enables a substantially fluid-tight, selective relative rotation between the rotor face and the stator face, at a rotor-stator interface, between two or more rotor positions. Users of multiple communication networks, such as VoIP, PSTN and wireless, employ multiple communication devices to communicate with their contacts.