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 82 For measuring or checking semiconductor wafers or devices 90 30 82 00 For measuring or checking semiconductor wafers or devices Commodity Code Description 90 30 82 00 000 For measuring or checking semiconductor wafers or devices