9017 - Drawing, marking-out or mathematical calculating instruments (for example, drafting machines, pantographs, protractors, drawing sets, slide rules, disc calculators); instruments for measuring length, for use in the hand (for example, measuring rods and tapes, micrometers, calipers), not specified or included elsewhere in this chapter; parts and accessories thereof:

This HTS category, 9017, encompasses a broad range of instruments primarily used for drawing, marking out, and mathematical calculations, as well as handheld measuring tools not elsewhere specified. It includes drafting machines and pantographs for creating technical drawings, protractors for measuring angles, and slide rules and disc calculators for performing mathematical operations. Additionally, this heading covers instruments for measuring length when used by hand, such as measuring rods, tapes, micrometers, and calipers. The key unifying factor is their role in precision measurement, layout, or calculation.

When considering this category, it is important to distinguish it from other related sections of Chapter 90. While instruments for measuring length are included here, categories focusing on more complex metrology or specific scientific applications (e.g., optical instruments) are classified elsewhere. Similarly, instruments for surveying or meteorological purposes, even if they involve measurement, fall under different headings. The "drawing, marking-out or mathematical calculating instruments" aspect differentiates this category from general office supplies or tools not designed for precision technical work.

The subcategories within 9017 further refine these classifications. Subheadings 9017.10 and 9017.20 distinguish between automated drafting machinery and other manual drawing or calculating tools. Subheading 9017.30 specifically addresses micrometers, calipers, and gauges, highlighting their function as precise length-measuring instruments. The residual subheading 9017.80.00.00 captures any remaining instruments fitting the general description but not specified in the preceding subheadings, while 9017.90.01 is reserved for parts and accessories for all instruments within this heading.