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 17 Drawing, marking-out... instruments; instruments for measuring length... 90 17 30 Micrometers, callipers and gauges 90 17 30 00 Micrometers, callipers and gauges Commodity Code Description 90 17 30 00 000 Micrometers, callipers and gauges