ELECTRONIC MEASURING INSTRUMENTS-NAMELY, FLAW AND THICKNESS TESTERS, DIGITAL THICKNESS GAUGES, ULTRASONIC TRANSDUCERS, ULTRASONIC TESTING AND MEASURING INSTRUMENTS, EDDY CURRENT MEASURING UNITS AND PROBES, PIEZOCERAMIC TRANSDUCER CRYSTALS, ULTRASONIC FLAW AND THICKNESS TESTERS; USED FOR THE DETECTION OF FLAWS IN THE MANUFACTURE OF PLATES, BARS, CASTINGS, EXTRUSIONS AND SIMILAR ITEMS IN THE FIELD, LABORATORY, OR ON A PRODUCTION LINE