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 17 Drawing, marking-out... instruments; instruments for measuring length... 90 17 90 Parts and accessories 90 17 90 00 Parts and accessories Commodity Code Description 90 17 90 00 000 Parts and accessories