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 20 Oscilloscopes and Oscillographs 90 30 20 00 Oscilloscopes and Oscillographs Commodity Code Description 90 30 20 00 000 Oscilloscopes and Oscillographs