Section 18 Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; clocks and watches; musical instruments; parts and accessories thereof 90 Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; parts and accessories thereof 90 30 OSCILLOSCOPES, SPECTRUM ANALYSERS AND OTHER INSTRUMENTS AND APPARATUS FOR MEASURING O 90 30 10 Instruments and apparatus for measuring or detecting ionising radiations 90 30 10 00 Instruments and apparatus for measuring or detecting ionising radiations Commodity Code Description 90 30 10 00 000 Instruments and apparatus for measuring or detecting ionising radiations