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 16 Balances of a sensitivity of 5cg or better,with or without weights 90 16 00 Balances of a sensitivity of 5 cg or better, with or without weights Commodity Code Description 90 16 00 00 Balances of a sensitivity of 5 cg or better, with or without weights