Eddy Current (ECT) Broad Band Probes are extremely versatile and work within many applications within Non-destructive Testing (NDT). Designed as a heavy-duty range of probes that can be used for general industrial use with impedance plane instruments only. Absolute Unshielded Broad Band Probes – for general-purpose inspection of surface breaking defects and metallurgy / conductivity variations and to estimate coating (Paint) thickness.