The special properties of non-magnetic bars and rods made from materials such as titanium, platinum, or gold require special sensor systems for surface testing as a higher frequency is requires for testing with eddy current:

BARPROOF: Using phased-array ultrasonic technology and coupling via a rotating water jacket, the BARPROOF reliably detects longitudinal surface defects and internal defects on bars with bright and hot-rolled surfaces.

CIRCOGRAPH: The CIRCOGRAPH test systems with rotating test heads perform contactless material scans to reliably detect longitudinal defects in the NFE material.

DEFECTOMAT: The DEFECTOMAT product family is used for reliably testing NFE bars for point and transverse defects in the material surface.