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SCIENTIFIC, WEIGHING AND MEASURING APPARATUS AND INSTRUMENTS FOR ON-LINE CONTINUOUS READING AND PROCESS CONTROL INSTRUMENTATION AND SENSORS FOR MEASUREMENT AND ANALYSIS OF PROPERTIES IN LIQUIDS - NAMELY, TURBIDITY/SUSPENDED SOLIDS ANALYZERS AND SENSORS, SLUDGE RETENTION TIME CONTROLLERS, AQUICULTURE POND MONITORING ANALYZERS, DISSOLVED OXYGEN ANALYZERS AND SENSORS, AND INTERFACE LEVEL ANALYZERS