26.51 - Manufacture of instruments and appliances for measuring, testing and navigation

26.51.11 - Direction-finding compasses; other navigational instruments and appliances 26.51.12 - Rangefinders, theodolites and tachymetres (tachometers); other surveying, hydrographic, oceanographic, hydrological, meteorological or geophysical instruments and appliances 26.51.20 - Radar apparatus and radio navigational aid apparatus 26.51.31 - Balances of a sensitivity of 5 cg or better 26.51.32 - Drafting tables and machines and other drawing, marking-out or mathematical calculating instruments 26.51.33 - Instruments for measuring length, for use in the hand (including micrometers and callipers) n.e.c. 26.51.41 - Instruments and apparatus for measuring or detecting ionising radiations 26.51.42 - Cathode-ray oscilloscopes and cathode-ray oscillographs 26.51.43 - Instruments for measuring electrical quantities without a recording device 26.51.44 - Instruments and apparatus for telecommunications 26.51.45 - Instruments and apparatus for measuring or checking electrical quantities n.e.c. 26.51.51 - Hydrometers, thermometers, pyrometers, barometers, hygrometers and psychrometers 26.51.52 - Instruments for measuring or checking the flow, level, pressure or other variables of liquids and gases 26.51.53 - Instruments and apparatus for physical or chemical analysis n.e.c. 26.51.61 - Microscopes (except optical microscopes) and diffraction apparatus 26.51.62 - Machines and appliances for testing the mechanical properties of materials 26.51.63 - Gas, liquid or electricity supply or production meters 26.51.64 - Revolution and production counters, taximeters; speed indicators and tachometers; stroboscopes 26.51.65 - Automatic regulating or controlling instruments and apparatus, hydraulic or pneumatic 26.51.66 - Measuring or checking instruments, appliances and machines n.e.c. 26.51.70 - Thermostats, manostats and other automatic regulating or controlling instruments and apparatus 26.51.81 - Parts of radar apparatus and radio navigational aid apparatus 26.51.82 - Parts and accessories for the goods of 26.51.12, 26.51.32, 26.51.33, 26.51.4 and 26.51.5; microtomes; parts n.e.c. 26.51.83 - Parts and accessories of microscopes (other than optical) and of diffraction apparatus 26.51.84 - Parts and accessories for the goods of 26.51.63 and 26.51.64 26.51.85 - Parts and accessories of instruments and apparatus of 26.51.65, 26.51.66 and 26.51.70 26.51.86 - Parts and accessories of instruments and apparatus of 26.51.11 and 26.51.62