9 SCIENTIFIC, ELECTRICAL, MEASURING AND CHECKING APPARATUS AND INSTRUMENTS, ENVIRONMENTAL INSTRUMENTATION, MARINE SCIENCE INSTRUMENTATION, COMPRISING WATER QUALITY MONITORING UNITS, WATER QUALITY ANALYZERS, METERING UNITS, SALINOMETERS, OXYGEN MONITORS, PH MONITORS, BATHYTHERMOGRAPHS, TRANSMISSIOMETERS, PH/ION SELECTIVE ELECTRODE METERS, WATER QUALITY CONTROLLERS, WATER QUALITY DATA ACQUISITION UNITS, DATA RECORDERS, WINCHES, DATA LOGGERS, DATA READERS, DATA PRINTERS, DATA ACQUISITION UNITS, WATER QUALITY MONITORS, AND PARTS THEREOF