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

Every line of heading 9027

• 9027 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.
• 9027.10 Gas or smoke analysis apparatus.
• 9027.10.20.00 Electrical (under: Gas or smoke analysis apparatus) (kg, No.): General Free; Special none; Column 2 40%.
• 9027.10.40.00 Optical instruments and apparatus (kg): General Free; Special none; Column 2 50%.
• 9027.10.60.00 Other (under: Other) (kg): General Free; Special none; Column 2 40%.
• 9027.20 Chromatographs and electrophoresis instruments.
• 9027.20.50 Electrical (under: Chromatographs and electrophoresis instruments): General Free; Special none; Column 2 40%.
• 9027.20.50.30 Electrophoresis instruments (under: Electrical) (No.).
• 9027.20.50.50 Gas chromatographs (under: Electrical) (No.).
• 9027.20.50.60 Liquid chromatographs (under: Electrical) (No.).
• 9027.20.50.80 Other (under: Electrical) (No.).
• 9027.20.80 Other (under: Chromatographs and electrophoresis instruments): General Free; Special none; Column 2 40%.
• 9027.20.80.30 Gas chromatographs (under: Other) (No.).
• 9027.20.80.60 Liquid chromatographs (under: Other) (No.).
• 9027.20.80.90 Other (under: Other) (No.).
• 9027.30 Spectrometers, spectrophotometers and spectrographs using optical radiations (ultraviolet, visible, infrared).
• 9027.30.40 Electrical (under: Spectrometers, spectrophotometers and spectrographs using optical radiations (ultraviolet, visible, infrared)): General Free; Special none; Column 2 40%.
• 9027.30.40.40 Spectrophotometers (under: Electrical) (No.).
• 9027.30.40.80 Other (under: Electrical) (No.).
• 9027.30.80 Other (under: Spectrometers, spectrophotometers and spectrographs using optical radiations (ultraviolet, visible, infrared)): General Free; Special none; Column 2 50%.
• 9027.30.80.20 Spectroscopes (under: Other) (No.).
• 9027.30.80.80 Other (under: Other) (No.).
• 9027.50 Other instruments and apparatus using optical radiations (ultraviolet, visible, infrared).
• 9027.50.10.00 Exposure meters (under: Other instruments and apparatus using optical radiations (ultraviolet, visible, infrared)) (No.): General 1.2%; Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 27.5%.
• 9027.50.40 Electrical (under: Other): General Free; Special none; Column 2 40%.
• 9027.50.40.15 Chemical analysis instruments and apparatus (No.).
• 9027.50.40.20 Thermal analysis instruments and apparatus (No.).
• 9027.50.40.50 Photometers (under: Electrical) (No.).
• 9027.50.40.60 Other (under: Electrical) (No.).
• 9027.50.80 Other (under: Other): General Free; Special none; Column 2 50%.
• 9027.50.80.15 Chemical analysis instruments and apparatus (No.).
• 9027.50.80.20 Thermal analysis instruments and apparatus (No.).
• 9027.50.80.60 Other (under: Other) (No.).
• 9027.81.00.00 Mass spectrometers (under: Other instruments and apparatus) (No.): General Free; Special none; Column 2 40%.
• 9027.89 Other (under: Other instruments and apparatus).
• 9027.89.25.00 Nuclear magnetic resonance instruments (No.): General Free; Special none; Column 2 40%.
• 9027.89.45 Electrical (under: Other): General Free; Special none; Column 2 40%.
• 9027.89.45.30 Chemical analysis instruments and apparatus (kg).
• 9027.89.45.60 Physical analysis instruments and apparatus (kg).
• 9027.89.45.90 Other (under: Electrical) (kg).
• 9027.89.80 Other (under: Other): General Free; Special none; Column 2 40%.
• 9027.89.80.30 Chemical analysis instruments and apparatus (kg).
• 9027.89.80.60 Physical analysis instruments and apparatus (kg).
• 9027.89.80.90 Other (under: Other) (kg).
• 9027.90 Microtomes; parts and accessories.
• 9027.90.20.00 Microtomes (under: Microtomes; parts and accessories) (No.): General Free; Special none; Column 2 40%.
• 9027.90.45.00 Printed circuit assemblies for the goods of subheading 9027.81 or 9027.89 (No.): General Free; Special none; Column 2 40%.
• 9027.90.54.00 Of electrophoresis instruments not incorporating an optical or other measuring device (kg): General Free; Special none; Column 2 40%.
• 9027.90.56 Of instruments and apparatus of subheading 9027.20, 9027.30, 9027.50, 9027.81 or 9027.89: General Free; Special none; Column 2 40%.
• 9027.90.56.25 Of articles of subheading 9027.20.50 (kg).
• 9027.90.56.30 Of articles of subheading 9027.30.40 (kg).
• 9027.90.56.40 Of articles of subheading 9027.50.10 (kg).
• 9027.90.56.50 Of articles of subheading 9027.50.40 (kg).
• 9027.90.56.95 Other (under: Of instruments and apparatus of subheading 9027.20, 9027.30, 9027.50, 9027.81 or 9027.89) (kg).
• 9027.90.59 Other (under: Other): General Free; Special none; Column 2 40%.
• 9027.90.59.10 Of articles of subheading 9027.10.20 (kg).
• 9027.90.59.95 Other (under: Other) (kg).
• 9027.90.64.00 Of instruments and apparatus of subheading 9027.20, 9027.30, 9027.50, 9027.81 or 9027.89 (kg): General Free; Special none; Column 2 50%.
• 9027.90.68.00 Other (under: Of optical instruments and apparatus) (kg): General Free; Special none; Column 2 50%.
• 9027.90.84.00 Of instruments and apparatus of subheading 9027.20, 9027.30, 9027.50, 9027.81 or 9027.89 (kg): General Free; Special none; Column 2 40%.
• 9027.90.88.00 Other (under: Other) (kg): General Free; Special none; Column 2 40%.

About these rates

The rates are those printed in the 2026 HTS Revision 23, published by the U.S. International Trade Commission. A 10-digit statistical line takes the rates printed on the 8-digit line above it. Chapter 99 duties (Section 232, Section 301, IEEPA) depend on the product, the origin and the date, are charged on top, and are not included. A code here is a strong lead, not a ruling: confirm it with a customs broker or a CBP binding ruling.