The eddy current method is applicable in measurements on electrically conductive materials. Among others, carbon fiber reinforced materials qualify in the plastics segment. Through a magnetic alternating field of a sensor coil, eddy currents are induced in the component, whose magnetic field opposes the exiting field in accordance with Lenz's law. This leads to a change in the alternating current resistance of the sensor coil and depends on the material characteristics of the test specimen. This way, different flaws, such as inclusions and pores, can be detected. Furthermore, changes in conductivity of the component, caused by fiber breakage for example, affect this non-destruction testing (NDT).