9 Scientific apparatus and instruments, namely, acoustic level sensors, ultrasonic level sensors, pressure sensors, filling level detectors, flow meters, temperature sensors, velocity sensors, physio-chemical sensors for use in measuring salinity, conductivity, ph, redox, temperature, turbidity and oxygen levels; electronic instruments for use in remote measurement and monitoring, namely, acoustic level sensors, ultrasonic level sensors, pressure sensors, filling level detectors, flow meters, temperature sensors, velocity sensors, physio-chemical sensors for use in measuring salinity, conductivity, ph, redox, temperature, turbidity and oxygen levels; data processors; data processing equipment and computers; computers; computer software for remote monitoring and logging of data; scientific apparatus and instruments based on RFID, namely, acoustic level sensors with RFID transmitter, ultrasonic level sensors with RFID transmitters, pressure sensors with RFID transmitters, filling level detectors with RFID transmitters, flow meters with RFID transmitters, temperature sensors with RFID transmitters, velocity sensors with RFID transmitters, physio-chemical sensors with RFID transmitters for use in measuring salinity, conductivity, ph, redox, temperature, turbidity and oxygen levels; apparatus for recording, transmission, processing and reproduction of sound, images or data; instruments for recording data, namely, electronic data loggers; radio transmitters; electric batteries; transmitters of electronic signals; water level indicators; technical measuring indicators for measuring the quantity of gas and liquids; temperature indicators; rain gauges to measure rainfall; LAN (local area network) access points for connecting network computer users