Electric and electronic measuring apparatus, in particular flowmeters, viscosity measuring apparatus, density measuring apparatus, apparatus for measuring the composition of a polyphase product, particularly of liquids, suspensions, emulsions, gases and/or vapors; signaling and monitoring apparatus and instruments; signal and data recording, transmission and reading apparatus; regulating apparatus, in particular electric and electronic regulating apparatus for regulating process and quality parameters; software for the commissioning, monitoring, control, maintenance and operation of measuring and regulation apparatus of the above-mentioned type; all the above-mentioned goods in measuring and automation technology, environmental measurement technology, particularly in the fields of the fresh water and sanitation industry, the beverage and food industry, the chemical industry, the pharmaceutical industry, the oil and gas industry, the nuclear industry, the paper industry and the basic industry