Data collection, data conversion and broadcasting apparatus; electronic database in the field of engineering recorded on computer media; data processors; computer programs for use in data processing; data entry, data exit and data display terminals; data processing systems comprised of algorithms embedded in FPGAs (Field Programmable Gate Arrays) for detecting, filtering, noise reduction, compression and analysis of ultrasonic signals for detection of defects in materials; interactive data transfer apparatus in the nature of network routers; electronic encryption apparatus; electronic data loggers and recorders; measuring instruments for performing non-destructive testing, namely, instruments for measuring the properties of a material, including thickness and profile, characterization, internal flaw detection and corrosion detection, using non-destructive testing techniques based on the propagation of ultrasonic waves; apparatus for the reproduction of ultrasound image