HTS code 9027.90.84.00 covers "Instruments and apparatus for physical or chemical analysis (for example, polarimeters, refractometers, spectrometers, gas or smoke analysis apparatus); instruments and apparatus for measuring or checking viscosity, porosity, expansion, surface tension or the like; instruments and apparatus for measuring or checking quantities of heat, sound or light (including exposure meters); microtomes; parts and accessories thereof › Microtomes; parts and accessories › Microtomes › Printed circuit assemblies for the goods of subheading 9027.81 or 9027.89 › Of instruments and apparatus of subheading 9027.20, 9027.30, 9027.50, 9027.81 or 9027.89" 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.