9026.20 - For measuring or checking pressure:

This HTS category, 9026.20, specifically covers instruments and apparatus designed for the measurement or verification of pressure. These devices are critical for a wide range of industrial, scientific, and commercial applications where monitoring pressure is essential for safety, process control, and performance. Examples include manometers, pressure gauges, pressure transmitters, and pressure switches.

While the parent heading 9026 encompasses instruments for measuring various variables of liquids and gases, 9026.20 narrows the focus solely to pressure. It is distinct from its sibling category, 9026.10, which deals with the measurement of flow or level. Similarly, it differs from 9026.80 ("Other instruments and apparatus") and the parts and accessories category 9026.90. The primary distinguishing factor is the specific function of pressure measurement.

The subcategories within 9026.20, namely 9026.20.40 (Electrical) and 9026.20.80 (Other), further refine classification based on the operational principle. Electrical instruments utilize electronic components, sensors, and signal processing for pressure measurement, often offering digital readouts and connectivity. "Other" encompasses mechanical or electro-mechanical devices that do not rely primarily on electrical principles for their pressure sensing and display.