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. Commodity Code Description 90 11 10 Stereoscopic microscopes 90 11 20 Other microscopes, for photomicrography, cinephotomicrography or microprojection 90 11 80 Other microscopes 90 11 90 Parts and accessories