9026.10 - For measuring or checking the flow or level of liquids:

This HTS category, 9026.10, specifically encompasses instruments and apparatus designed for the measurement or verification of the flow or level of liquids. This includes devices that quantify the rate at which a liquid moves through a system (flow meters) or indicate the quantity of liquid present in a container or vessel (level gauges). The primary function of these goods is to monitor and control liquid volumes and movements within industrial, commercial, or scientific applications.

Distinguishing this category from its siblings, 9026.20 covers instruments for measuring or checking pressure, while 9026.80 pertains to other miscellaneous measuring instruments for liquids or gases not specifically covered elsewhere in heading 9026. Furthermore, 9026.90 is reserved solely for parts and accessories of the instruments described within heading 9026. Therefore, 9026.10 is exclusively focused on flow and level measurement of liquids.

The subcategories within 9026.10 serve to further refine classification based on the operational principle of the instrument. The "Electrical" subdivision (9026.10.20) includes devices that utilize electrical principles for measurement, such as those employing electromagnetic flow sensing or electronic capacitance level detection. The "Other" subdivision captures instruments that operate through mechanical, hydraulic, or other non-electrical means for determining liquid flow or level.