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 24 Machines/appliances for testing the hardness, strength... of material 90 24 90 Parts and accessories 90 24 90 00 Parts and accessories Commodity Code Description 90 24 90 00 000 Parts and accessories