Section 18 OPTICAL, PHOTOGRAPHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION , MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; M USICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 Optical, photographic, cinematographic measuring, checking, precision, medical o 90 13 Liquid crystal devices not constituting articles provided for more specifically 90 13 10 90 13 10 00 Commodity Code Description 90 13 10 00 00 - Telescopic sights for fitting to arms; periscopes; telescopes designed to form parts o 90 13 20 00 00 - Lasers, other than laser diodes 90 13 80 00 00 - Other devices, appliances and instruments 90 13 90 00 00 - Parts and accessories