Chapter 90 covers optical, photographic, cinematographic, measuring, checking, medical or surgical instruments and apparatus, precision instruments and apparatus; parts and accessories thereof. Goods of this chapter are characterized by high technology content and precision manufacturing, and are widely used in industry, medical care, scientific research and other fields. Within the chapter, they are divided by function into headings for measuring, checking, medical, controlling, etc. The classification of parts must follow the principle of "solely or principally used". Heading 9025 covers thermometers, pyrometers, barometers, hygrometers, psychrometers, whether or not combined, and parts and accessories of such instruments. This heading includes various temperature measuring instruments, such as liquid thermometers, bimetallic thermometers, electronic thermometers, etc., whether or not with recording devices. Their parts include temperature sensing elements, dials, housings and other components solely used for thermometers. The first 2 digits 90: indicates Chapter 90, covering optical, measuring, medical and other instruments and apparatus. The 3rd-4th digits 25: indicates heading 9025, specifically thermometers, pyrometers and other measuring instruments and their parts. The 5th-6th digits 90: indicates subheading 902590, specifically referring to parts and accessories of the instruments listed in heading 9025. Therefore, the complete meaning of 902590 is "parts and accessories of thermometers, pyrometers and similar instruments", excluding complete machines. Vehicle thermometer parts are solely used for vehicle thermometers, and vehicle thermometers belong to temperature measuring instruments, classified under heading 9025. According to General Rules of Interpretation 1 and 6, if their parts are solely or principally used for thermometers, they are classified under 902590. If the part has an independent function or can be used for other equipment, it may be classified under other headings.

Product Name: The specific name of the declared goods, which should accurately reflect the purpose and material of the part, such as "temperature sensing probe for vehicle thermometer". Purpose: Clearly state that the part is solely used for vehicle thermometers, such as "used for temperature measurement in automotive air conditioning systems". Material: Declare the main material of the part, such as copper, stainless steel, plastic, electronic components, etc. Brand: Fill in the brand name of the part; if no brand, fill in "no brand". Model: Fill in the model or specification of the part to match with the complete machine. Whether Solely Used for Thermometers: Declare whether the part is solely or principally used for thermometers, which is the key to classification. Working Principle: Briefly describe the function of the part in the thermometer, such as temperature sensing, display, conduction, etc. Customs declaration example: Product Name: Temperature sensing probe for vehicle thermometer Purpose: Used for temperature measurement in automotive air conditioning systems Material: Copper alloy Brand: DENSO Model: XYZ-123 Whether solely used for thermometers: Yes Working Principle: Uses a thermistor whose resistance changes with temperature to output an electrical signal. HS Code: 9025900090 Declaration elements: 1. Product Name: Temperature sensing probe for vehicle thermometer; 2. Purpose: Automotive air conditioning system; 3. Material: Copper alloy; 4. Brand: DENSO; 5. Model: XYZ-123; 6. Whether solely used for thermometers: Yes; 7. Working Principle: Thermistor temperature sensing. Mistakenly classifying complete thermometers under 902590; complete machines should be classified under other subheadings of 9025. Declaring general parts (such as standard screws) as special parts, leading to classification errors. Failure to distinguish vehicle thermometer parts from industrial thermometer parts; both may be classified under the same code, but inaccurate purpose declaration may affect supervision.

The core basis for classification is the Import and Export Tariff and the HS Explanatory Notes. Heading 9025 explicitly includes thermometers, pyrometers and their parts. Vehicle thermometers belong to temperature measuring instruments, and their special parts meet the principle of "solely or principally used", so they are classified under 902590. If the part is a general part, it is classified by material. If the part has an independent function, it may be classified under other headings. 902519 Other thermometers: 902519 is for complete thermometers, while 902590 is for parts. If a complete thermometer is declared, it should be classified under 902519; if only a part, it is classified under 902590. 902580 Other measuring instruments: 902580 covers other measuring instruments (such as densimeters, flow meters). If parts are solely used for these instruments, they are classified under 902590; if solely used for thermometers, they are also classified under 902590. 903290 Parts of automatic regulating controllers: 903290 is for parts of automatic regulating or controlling instruments. If vehicle thermometer parts have a control function, they may be classified under 903290, but pure temperature sensing parts are still classified under 902590. 854390 Parts of electronic equipment: If thermometer parts are general electronic components (such as resistors) and are not solely used for thermometers, they may be classified under 854390; however, electronic components solely used for thermometers are still classified under 902590. Is the part solely or principally used for thermometers? Does the part have an independent function? Has the complete machine been classified under 9025? Is the part a general-purpose part? Has material-based classification been considered?

Is there a difference in HS code between vehicle thermometer parts and ordinary thermometer parts? There is no difference. HS code 902590 covers all thermometer parts, whether or not for vehicles. However, the purpose must be stated during declaration for customs supervision. Vehicle thermometer parts may involve automotive component certification, and relevant certificates may be required. How to determine whether a part is solely used for thermometers? Based on the design, function and usage environment of the part. If the part can only be used for thermometers, or is principally used for thermometers, it is considered special. For example, a temperature sensing probe specifically for thermometers. If it can be used for other equipment, it is a general part. What elements need to be declared for 902590? Usually includes product name, purpose, material, brand, model, whether solely used for thermometers, working principle, etc. The specific requirements are subject to customs requirements. It is recommended to check the latest declaration element table. If thermometer parts are imported for repair, can they be classified under 902590? Yes. As long as the part is solely used for thermometers, whether for production or repair, it is classified under 902590. However, note that repair parts may involve warranty or after-sales service, and relevant documents may be required. How to check the tariff rate for 902590? Tariff rates may change. It is recommended to obtain the latest rates through the General Administration of Customs website, China International Trade Single Window, or professional tariff query tools by entering the HS code, country of origin, trade mode and other conditions. What is the difference in classification between thermometer parts and temperature sensors? If a temperature sensor is an independent device, it may be classified under 8533 or 9025; if it is a part solely used for thermometers, it is classified under 902590. The key is whether it is solely used for thermometers. For exporting vehicle thermometer parts to the EU, is the HS code the same? The first 6 digits of the EU HS code are the same as China's, both 902590. However, the latter digits may differ, and the EU TARIC database should be consulted. Also note EU CE certification and other requirements. How to distinguish 902590 from 902519 during customs declaration? 902519 is for complete thermometers, 902590 is for parts. If a complete thermometer is imported, it is classified under 902519; if only a part, it is classified under 902590. Product pictures, manuals and other evidence may be required during declaration.