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 11 Compound optical microscopes, including those for photomicrography, cinephotomicrography or microprojection. 90 11 90 Parts and accessories Commodity Code Description 90 11 90 00 Parts and accessories