Absolute probes, differential and multi differential probes Dynamic testing for minute defects with high local resolution and great sensitivity, carried out almost independently of the feed speed. At the same time, the highly developed filtering technology in our test systems is employed to the full and most interfering effects can be suppressed. We have the appropriate system for all investigations of plane surfaces, small and largeholes, pipe interiors and exteriors, ranging from 0.8 mm to 200 mm.