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 10 Microscopes other than optical microscopes; diffraction appratus Commodity Code Description 90 12 10 00 Microscopes other than optical microscopes; diffraction appratus