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Measuring and control apparatus for use in analysis and measuring technology; electric, electronic, electrochemical, conductometric, inductive and photometric measuring devices, measuring transducers, measuring fittings, sensors and heads, mainly for measuring pH values, electrochemical potential, electric conductivity, dissolved oxygen, turbidity, the valency of free and bound chlorine, temperature, solid content, level, flow, humidity and pressure; measuring, checking (supervision) and control apparatus for industrial purposes; connection fittings being accessories for the aforesaid goods, in particular control fittings, taps (faucets), throttle and butterfly valves, valves, sampling fittings and apparatus; process fittings and interchangeable fittings for taking measurements in chemical processes, in food production, in the paper-making industry, in brewing, in power stations, for taking measurements in pipelines and containers; switches; amplifiers; microprocessors; connector plugs, plug-type couplings; plugs for connector heads, threaded plug heads, electrodes; connector cables; measuring cables for connecting the aforesaid goods, remote signal transmission apparatus; lightning protection apparatus, housings for electronic measuring apparatus; field and maintenance housings for electronic measuring apparatus; fittings, controls for fittings; devices for conducting chemical and/or physical analysis; analysis and measuring devices, namely for recording water contents, for controlling water, for water treatment and the treatment of sludge mixtures, for determining nitrate, ammonium, phosphate, pH value, redox potential, turbidity, coloration, oxygen content, chlorine content, chloroxide content, electrical conductivity, based in particular on colorimetric, ion-sensitive, photometric, optical measuring processes or conductivity measuring processes; sampling containers, sedimentation apparatus, sample processing apparatus, photometers, sample pumps, reagent pumps, evaluation and control devices; devices for storing measurements; online measuring apparatus