Electric, electronic and electrochemical apparatus and instruments, in particular measuring and remote control devices, namely, buffer amplifiers, electrical railway transducers, high-voltage transducers, signal conditioning devices for industrial process controls, temperature transmitters, loop-powered and mains-powered electrical isolators for standard signals, electrical transducers for shunt applications, electrical repeater power supplies, universal electrical transmitters, strain gauge electrical transmitters, electrical resistance transmitters, AC/DC transducers, power supply units, electrical signal doublers, set point alarm electrical relays, electronic indicator panels, electronic indicator boards; measuring apparatus for measuring the pH- value, redox potential, conductivity or oxygen contents of liquids, namely, immersion fittings, flow-through fittings inline fittings, retractable fittings, ball-valve fittings, liquid analyzers for measuring the pH-value, redox potential, conductivity or oxygen contents of liquids; sensors included in the class, namely, pH sensors, electrical conductivity sensors, oxygen sensors, all not for medical use; parts of the before-mentioned goods, namely, calibration devices for calibrating measuring apparatus for measuring the pH-value, redox potential, conductivity or oxygen contents of liquids, industrial transmitters for measuring the pH-value, redox potential, conductivity or oxygen contents; all before-mentioned goods included in this class; all of the aforementioned goods only in the technological fields of industrial measurement, industrial process automation and building automation, environmental measuring, medical engineering and traffic engineering; all of the aforementioned goods not in the field of office technology or office equipment