9030.90.89.40 - Of articles of subheading 9030.40

This HTS classification, 9030.90.89.40, specifically covers parts and accessories for instruments and apparatus classified under subheading 9030.40. Subheading 9030.40 encompasses instruments and apparatus specifically designed for measuring or checking electrical quantities, excluding general electricity meters. This often includes specialized equipment used in niche electronic testing, research, or calibration where precise electrical measurements are paramount. Therefore, this category is for components, components, or ancillary items that are exclusively designed or adapted for use with these specific electrical measuring and checking instruments falling under 9030.40.

To differentiate, the sibling categories at this level (e.g., 9030.90.89.11, 9030.90.89.21, etc.) are designated for parts and accessories of instruments falling under different subheadings of 9030, such as those for measuring or checking electrical quantities generally (9030.20, 9030.31, 9030.32, 9030.33, 9030.39) or those for measuring ionizing radiations. The key distinction for 9030.90.89.40 lies in its exclusive link to the specialized electrical measuring and checking instruments found in subheading 9030.40.

As this node is a leaf node in the HTS classification, there are no further subdivisions. Classification under 9030.90.89.40 is final for parts and accessories directly attributable to instruments under 9030.40. Examples of such parts and accessories could include specialized probes, signal conditioning modules, internal circuitry components, or protective enclosures specifically engineered for instruments designed for precise electrical measurements beyond general utility. The classification hinges on the direct and exclusive functional relationship of the part or accessory to the instruments found in subheading 9030.40.