Manufacture of laboratory and scientific instruments and apparatus n.e.c. microscopes other than optical microscopes apparatus for measuring and checking electrical quantities (oscilloscopes spectrum analyzers instruments for checking current voltage resistance) for measuring and checking non-electrical quantities (radiation detectors and counters apparatus for testing and regulating vehicle motors and instruments and apparatus specially designed for telecommunications such as cross-talk meters) for testing physical properties of the materials for carrying out physical or chemical analysis and for measuring or checking the flow level pressure or other variables of liquids