9017.30.40.00 - Micrometers and calipers

This HTS category, 9017.30.40.00, specifically covers micrometers and calipers intended for measuring length, designed for use in the hand. These instruments are precision tools utilized for accurate dimensional measurement. Micrometers typically employ a screw mechanism to provide highly precise measurements, often of smaller dimensions, while calipers are used for measuring external and internal dimensions or depth, commonly featuring adjustable jaws.

This classification distinguishes itself from sibling category 9017.30.80.00, which is designated for "Other" measuring instruments within the broader micrometers, calipers, and gauges grouping. Therefore, while 9017.30.40.00 precisely enumerates micrometers and calipers, the "Other" category would encompass any other types of hand-held length measuring instruments not specifically listed, such as certain types of rulers or specialized gauges that do not fit the definition of micrometers or calipers.

As this is a leaf node within the HTS, there are no further subcategories for this specific classification. Classification under 9017.30.40.00 is determined by the instrument's design and primary function as a hand-held micrometer or caliper for precise length measurement, aligning with the broader scope of drawing, marking-out, or mathematical calculating instruments and instruments for measuring length outlined in heading 9017.