| 90 | Optical instruments and apparatus, photographic, cinematographic, measuring, checking, precision, medical or surgical; parts and accessories |
| 9026 | Instruments and apparatus for measurement and control of flow, level, pressure or other variables of liquids or gases (for example, flow meters, level indicator, pressure gauge, heat meters), excluding instruments and apparatus of heading 9014, 9015, 902 |
| 902690 | Parts and accessories instruments and apparatus for measurement and control of flow, level, pressure or other variables of liquids or gases |
| 9026900009 | Parts and accessories of instruments and apparatus for measuring variables of liquids or gases other |