9015.90.01.20 - Of theodolites and tachymeters

This HTS category, 9015.90.01.20, specifically covers parts and accessories for theodolites and tachymeters. Theodolites are precision optical instruments used in surveying and engineering for measuring horizontal and vertical angles. Tachymeters, often integrated with or similar to theodolites, are instruments that also measure distance, typically by employing stadia lines within the telescope. Therefore, items classified here are components designed to be incorporated into or used with these angle-measuring and distance-measuring surveying instruments, such as specific lenses, tripods, carrying cases, calibration tools, or replacement parts like reticles or leveling screws.

It is crucial to distinguish this category from its siblings. For instance, parts for rangefinders (9015.90.01.10) are dedicated to instruments that measure distance to a target, typically through optical or laser means, but do not inherently measure angles. Similarly, parts for levels (9015.90.01.30) are intended for instruments that establish a horizontal plane, focusing solely on vertical height differences rather than angles or distances. This classification is also distinct from parts for photogrammetrical surveying instruments (9015.90.01.40), which are used for creating maps from aerial or ground photographs.

As this is a leaf node, there are no further subcategories under HTS 9015.90.01.20. Classification at this level is determined by the direct intended use and design of the part or accessory with a theodolite or tachymeter. When classifying, consider whether the component is specifically manufactured to function with the unique mechanisms and optical systems of these particular surveying instruments.