Accurate classification is vital to avoid customs delays. Generally, HS Code 9026 is used for instruments measuring flow, level, or pressure of liquids/gases. HS Code 9027 applies to instruments for physical or chemical analysis. For electronic integrated circuit sensors, HS Code 8542 may apply, while generic electrical sensors often fall under HS Code 8543. Always verify the specific technical function with your supplier to ensure the code matches the General Rules for the Interpretation (GRI) of the Harmonized System.