Scientific, surveying, optical, weighing, measuring, signalling and checking (supervision) apparatus and instruments; scientific or measuring apparatus and instruments for testing or studying liquid levels on a physical or chemical basis and optical and electrotechnical apparatus, included in this class, in particular those used for mining technology, oil technology, drilling technology and conveying technology, and navigation; measuring apparatus for determining liquid levels; compact discs, DVDs and other digital recording media; data processing equipment, computers; computer software; apparatus for recording, transmission or reproduction of sound or images; apparatus for measuring compression; pressure and temperature probes for deep well drilling; apparatus for extracting samples and apparatus for transporting samples, included in this class; instruments for monitoring rod depth points