90273010000 under HS Code 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 - SPECTROMETERS, SPECTROPHOTOMETERS AND SPECTROGRAPHS USING OPTICAL RADIATIONS (UV, VISIBLE, IR): SPECTROMETERS, 90279099000 under HS Code Others, and 49019990000 under HS Code Others were the top imported HS Codes by CAS COLOR APPLICATION SPECIALIST in 2023.