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 13 Lasers, other than laser diodes; other optical appliances and instrume nts, not specified or included elsewhere in this Chapter. Commodity Code Description 90 13 10 Telescopic sights for fitting to arms; periscopes, etc 90 13 20 Lasers, other than laser diodes 90 13 80 Other devices, appliances and instruments 90 13 90 Parts and accessories of lasers and optical devices, nes, of 90.13