9 electronic instruments for non-destructive material testing; electronic instruments for measuring of electric, magnetic or other physical properties; electronic instruments for measuring of layer thickness, film thickness or other dimensions; detectors for ferromagnetic and metallic objects; testing system, namely for non-destructive material testing primarily consisting of the aforementioned electronic instruments, probes, sensor heads, sensor coils and display units; electronic data processing equipment, namely computers for control of the aforementioned electronic instruments and testing system as well as for the evaluation of information produced therein; computer programs recorded on data carriers for the control of the aforementioned electronic instruments and testing system as well as for the evaluation of information produced therein