Measuring and testing apparatus for use in producing pipes, wires, bands, steel rods, billets, rails and sections, namely, scales, ammeters, wattmeters, thermometers, water analyzers, gas and air analyzers, automatic chemical analyzers, speed measuring apparatuses, namely, speedometers and speed indicators, pressure measuring apparatus, namely, pressure gauges, pressure detectors and pressure indicators, angle gauges, distance meters, surface roughness gauges, strip flatness meters, length an...