90303310 under HS Code OSCILLOSCOPES, SPECTRUM ANALYSERS AND OTHER INSTRUMENTS AND APPARATUS FOR MEASURING OR CHECKING ELECTRICAL QUANTITIES, EXCLUDING METERS OF HEADING 9028; INSTRUMENTS AND APPARATUS FOR MEASURING OR DETECTING ALPHA, BETA, GAMMA, X-RAY, COSMIC OR OTHER IONISING RADIATIONS - OTHER INSTRUMENTS AND APPARATUS, FOR MEASURING OR CHECKING VOLTAGE, CURRENT, RESISTANCE OR POWER: -- OTHER, WITHOUT A RECORDING DEVICE:AMMETERS, VOLT METERS AND WATT METERS, 90258020 under HS Code HYDROMETERS AND SIMILAR FLOATING INSTRUMENTS, THERMOMETERS, PYROMETERS, BAROMETERS, HYGROMETERS AND PSYCHROMETERS, RECORDING OR NOT, AND ANY COMBINATION OF THESE INSTRUMENTS - OTHER INSTRUMENTS: BAROMETERS, NOT COMBINED WITH OTHER INSTRUMENTS, and 90261030 under HS Code Others were the top imported HS Codes by DYNAMIC TECHNOLOGY RESEARCH AND APPLICATION INVESTMENT JOINT STOCK COMPANY in 2021.