FET-99S intelligent digital type eddy current detector is suitable for online offline flaw detection metal pipes,wire rods, steel pipe,and electromagnetic wire,copper wire,aluminum wire.It also can be suitable for automatic detection of other mechanical parts .It has relatively independent detecting channel,and drive combined probes formed by absolute and differential coils,detecting channel collecting data at the same time so as to detect longitudinal cracks and transverse flaw of metal pipes ,wire rods during they are produced .It has high degree of sensitivity on concealed joint ,open crack and so on axial flaw.