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, me Thereof. 90 26 Instruments and apparatus for measuring or checking the flow, level, pressure or other variables of liquids or gases (for example, flow meters, level gauges, manometers, heat meters), excluding instruments and apparatus of heading 9014, 9015, 9028 or 9032 Commodity Code Description 90 26 10 - For measuring or checking the flow or level of liquids 90 26 20 - For measuring or checking pressure 90 26 80 - Other instruments or apparatus 90 26 90 - Parts and accessories