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Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; automatic vending machines and mechanisms for coin-operated apparatus; cash registers, calculating machines, data processing equipment and computers; fire-extinguishing apparatus.
sensors and probes for the measurement of ph, oxidation-reduction potential, conductivity, turbidity, dissolved oxygen, ozone, residual chlorine, liquid level, fluid flow, fluid color, and associated analytical parameters, the analyzers used therewith, and electrical controllers for controlling the above-mentioned parameters, all used in connection with drinking water and waste water treatment and the control of industrial liquid processes