HTS code 9902.16.95 covers "Position sensors, each designed to emit digital pulses when rotated or moved linearly, consisting of an outer housing with dimensions of approximately 67 mm by 50 mm by 24 mm that contains an electrical connector and a printed circuit assembly, such sensors certified by the importer as designed for use in ground-based observatories (provided for in subheading 8543.70.45)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.