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 12 Microscopes other than optical microscopes; diffraction apparatus. 90 12 90 Parts and accessories of microscopes and diffraction apparatus of 90.12 Commodity Code Description 90 12 90 00 Parts and accessories of microscopes and diffraction apparatus of 90.12