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 31 Measuring or checking instruments, appliances and machines, not specified or included elsewhere in this Chapter; profile projectors. 90 31 41 For inspecting semiconductor wafers or devices, photomasks or reticles used in..., Commodity Code Description 90 31 41 00 For inspecting semiconductor wafers or devices, photomasks or reticles used in...,