MEASURING APPARATUS, NAMELY, SENSORS, REDOX SENSORS, DISSOLVED OXYGEN SENSORS, CO2 SENSORS, OPTICAL DENSITY SENSORS, GLUCLOSE SENSORS, PH SENSORS, ELECTROCHEMICAL SENSORS, POTENTIOMETRIC SENSORS; OPTICAL DISSOLVED OXYGEN SENSORS, ULTRASONIC SENSORS; SENSORS FOR MEASURING PH OF WATER AND WASTE WATER, SENSORS FOR MEASURING THE PH OF PROCESS MEDIA, TEMPERATURE SENSORS, SENSORS FOR MEASURING THE INTERNAL CHEMISTRY OF AQUEOUS SOLUTIONS, SENSORS FOR MEASURING PARAMETERS IN AN AQUEOUS MEDIA, NOT FOR...