90118000 under HS Code COMPOUND OPTICAL MICROSCOPES, INCLUDING THOSE FOR PHOTOMICRO-GRAPHY, CINEPHOTOMICROGRAPHY OR MICROPROJECTION - OTHER MICROSCOPES and 90275020 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 - OTHER INSTRUMENTS AND APPARATUS USING OPTICAL RADIATIONS (UV, VISIBLE, IR): REFRACTOMETERS were the top imported HS Codes by KIRAN CHANDRA SARKAR in 2021.