Scientific and electrical apparatuses for weighing, measuring and monitoring in the field of liquid analysis; Sensors for measuring liquid levels; Sensors for measuring gas levels, Sensors for measuring pressure; Electrochemical testing devices; Devices for use in electrochemical treatment of liquids; Digital PH meters and temperature indicators; Electrochemical oxygen monitors and sensors; Sensors for measuring ORP; Sensors for measuring PH; Sensors for measuring dissolved oxygen; Sensors for measuring conductivity; Ion-selective sensors; Infrared temperature measuring devices; PH probes for control in electrochemical apparatus; PH probes for measurement in electrochemical apparatus; Instruments for testing gas, liquids, and solids; Instruments for measuring pressure; Instruments for measuring total dissolved solids, pipettes and tips therefor; Measuring probes for monitoring sewage plants; Measuring probes for monitoring waste water plants; Diagnostic ultrasound instruments, other than for medical use; Non-selective electrodes being chemically sensitive probes, other than for medical use; Downloadable computer software for mobile phones and mobile computing devices, namely, software for controlling instruments equipment for weighing, measuring and monitoring in the field of liquid analysis; downloadable computer software for mobile phones and mobile computing devices, namely, management software and hardware for accessing, storing, retrieving, analysing, measuring and processing collected data; downloadable software for controlling, measuring, monitoring, and evaluating measuring instruments and equipment