9 Scientific, surveying, optical, weighing, measuring, signaling and monitoring apparatus for use in the plastics film manufacturing and processing industry, namely, electric meters, digital multimeters, resistivity meters, ohm meters, volume meters, electronic analyzers for measuring volume and service resistivity and impedance, dynamic signal electronic analyzer for material measurement, electronic test and measurement equipment, namely, spectrum analyzers; flow rate measuring devices, namely, flow meters; temperature measuring devices, namely, thermometer and temperature controllers in the nature of contacting and non-contacting temperature sensors, non-medical thermometers and infrared contactless sensors; measuring devices of foil thickness, namely, thickness measuring instruments; measuring instruments for measuring tension in plastic foil, in particular in the form of a stretching frame; metering devices and metering means composed thereof for plastic granules with or without fillers, namely, plastic granule flow meters; metering devices and metering means composed thereof for melt metering, namely, plastic melt flow meters; apparatus and instruments for conducting, switching, converting, regulating and controlling electricity, namely, electricity distribution consoles; devices for recording, transmitting and reproduction of sound and images; magnetic recording device, namely, blank magnetic carriers; memories for software and data, namely, computer memories; calculating machines; data processing devices and computers, in particular for the production of plastic foil or for machines, for heating installations, for air heating installations, installations for boiling, drying, flame treatment, waste heat recovery; component and structural parts of the aforementioned goods