Scientific, nautical, surveying, optical, weighing, measuring, signalling and checking (supervision) apparatus and instruments and computer software for use therewith; control and testing apparatus using capacitive and infrared radar, ultrasonic and radio sensor systems and other technical sensor principles; ultrasonic measurement tools, equipment and apparatus; ultrasonic apparatus for inspections, tests, analysis and quality control; ultrasonic apparatus for scanning and measuring; ultrasonic appliances and electrical apparatus for measurement of metal thickness and for detecting leaks; ultrasonic listening devices for leak detection; measurement probe handling apparatus for use in detecting leaks; ultrasonic transmitting apparatus; probes for scientific purposes and for measuring purposes; electronic apparatus and instruments for gauging thickness of materials or of surface coatings; electronic apparatus and instruments for detecting leaks; electronic apparatus and instruments for measuring velocity; electronic apparatus and instruments for logging data relating to metal thickness; electric measuring devices; precision measuring equipment; electronic apparatus and instruments for measuring, detecting, monitoring and control for use under water; nondestructive testing instruments, namely, ultrasonic flaw detectors and instruments for the non-destructive analysis of materials and the surface of materials; scientific and electronic apparatus and instruments for non-destructive tests, for determining condition, for checking condition and for inspection purposes; tools, equipment and apparatus for measuring thickness and leaks; parts and fittings for all the aforesaid goods