90278030 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: INSTRUMENTS AND APPARATUS FOR MEASURING THE SURFACE OR INTERFOCIAL TENSION OF LIQUIDS, 38259000 under HS Code RESIDUAL PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES, NOT ELSEWHERE SPECIFIED OR INCLUDED; MUNICIPAL WASTE; SEWAGE SLUDGE; OTHER WASTES SPECIFIED IN NOTE 6 TO THIS CHAPTER OTHER, and 96190012 under HS Code Others were the top imported HS Codes by DA NANG UNIVERSITY in 2021.