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, me Thereof. 90 11 Compound optical microscopes, including those for photomicrography, cinephotomicrography or microprojection 90 11 10 - Stereoscopic microscopes Commodity Code Description 90 11 10 00 - Stereoscopic microscopes