9027901000 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 - MICROTOMES; PARTS AND ACCESSORIES : MICROTOMES, INCLUDING PARTS AND ACCESSORIES THEREOF, 8537109100 under HS Code Others, and 8208900000 under HS Code Others were the top imported HS Codes by LABTEKHBIO LLC in 2021.