Chapter 90 covers optical, photographic, cinematographic, measuring, checking, medical or surgical instruments and apparatus; parts and accessories thereof. This chapter covers a wide range, from simple spectacle lenses to complex medical imaging equipment. The core characteristic is that these goods are generally used for measuring, checking, analyzing, controlling or medical purposes, and are highly technical and precise. This chapter does not include general-purpose machinery (classified in Chapter 84) or electrical equipment (classified in Chapter 85), unless they are specifically for the instruments or apparatus listed in this chapter. Heading 9025 covers: hydrometers, areometers, floating density meters, hygrometers, psychrometers, recording hygrometers, any combination of the foregoing instruments; thermometers, pyrometers, barometers, hygrometers, psychrometers, and combinations thereof; parts and accessories of these instruments. The core of this heading is instruments for measuring or recording physical parameters such as density, specific gravity, humidity, temperature, and atmospheric pressure of gases, liquids or solids. Note that this heading does not include radiation thermometers (classified in 9027) or instruments not specifically for measuring the above parameters. Code 902580 consists of 6 digits. The first 2 digits "90" represent Chapter 90, i.e., optical, photographic, measuring, checking, medical and other precision instruments and equipment. Digits 3-4 "25" represent heading 9025, i.e., hydrometers, areometers, hygrometers, thermometers and other instruments for measuring physical parameters. Digits 5-6 "80" is the subheading, meaning "other instruments". Under heading 9025, subheadings 9025.11 to 9025.80 are divided by specific type: for example, 9025.11 is thermometers, 9025.19 is other thermometers, 9025.20 is barometers, and 9025.80 is other instruments. Therefore, 902580 specifically refers to other hygrometers, density meters and similar instruments not elsewhere specified. Since a vehicle-mounted hygrometer is not a thermometer or barometer and has no more specific subheading, it is classified under this subheading. A vehicle-mounted hygrometer is used to measure the humidity of the air inside a vehicle and is a type of hygrometer. According to HS classification rules, hygrometers are explicitly listed in the text of heading 9025 ("hygrometers"), and the goods are not thermometers or barometers, so they should be classified under subheading 902580 (other instruments). It should not be classified under 9025.11 (thermometers) or 9025.20 (barometers), nor does it belong to Chapter 87 vehicle parts, because its function is to independently measure humidity, not as a part necessary for vehicle operation.

Product Name: The standard name of the declared commodity, which should accurately reflect the function of the goods, such as "vehicle-mounted hygrometer" or "automotive hygrometer". Use: Explain the usage scenario of the goods, such as "used to measure the humidity of the air inside a vehicle, installed on the automobile dashboard". Working Principle: Briefly describe the method of measuring humidity, such as "capacitive polymer film sensor" or "psychrometric principle". Brand: Fill in the brand of the goods (if no brand, write "none"); the brand affects price and classification judgment. Model: Fill in the specific model or specification to facilitate customs identification of product features. Whether with Recording Function: Indicate whether it has data recording or storage function, which affects whether it is classified as a recording hygrometer. Whether Combined with Thermometer: Indicate whether it is combined with a temperature measurement function; if combined, it may be classified under another subheading. Installation Method: Indicate whether it is embedded, adhesive or freestanding, to assist in judging whether it is specifically for vehicles. Customs declaration example: Product Name: Vehicle-mounted hygrometer Use: Used to measure the humidity of the air inside an automobile, installed on the dashboard Working Principle: Capacitive polymer film sensor, outputs electrical signal Brand: XYZ Model: H-2020 Whether with Recording Function: No Whether Combined with Thermometer: No Installation Method: Embedded Classification: 9025800090 (other hygrometers) Remarks: This product is an independent humidity measuring instrument, not a vehicle part. Incorrectly classifying a vehicle-mounted hygrometer under 8708 (vehicle parts), ignoring its independent measurement function. Failure to distinguish whether it has a recording function; if it has a recording function, it may be classified under 9025.80 other, but it needs to be confirmed whether it is a recording type. Incorrectly classifying a product combining a hygrometer and thermometer under 9025.80, when it may actually be classified under 9025.19 (other thermometers) or 9025.80. Ignoring the description of the working principle, leading customs to question the accuracy of classification.

The core basis for classification is the text of HS heading 9025, which explicitly includes "hygrometers". The function of a vehicle-mounted hygrometer is to measure humidity, which conforms to the heading description. According to General Rule of Interpretation 1, classification shall be according to the terms of the heading. At the same time, it is necessary to confirm whether the goods belong to Chapter 87 vehicle parts. Since a hygrometer is an independent measuring instrument, is not necessary for vehicle operation, and is not integrated with other vehicle systems, it is not classified under Chapter 87. In addition, if a hygrometer is combined with a thermometer, it must be judged according to the main function or the specific subheading, but a pure hygrometer is still classified under 9025.80. 902511 Thermometers: 902511 is liquid thermometers, directly measuring temperature; a vehicle-mounted hygrometer measures humidity, with a different function, and cannot be classified under it. 902519 Other thermometers: 902519 includes electronic thermometers, etc., but the measured parameter is temperature; a hygrometer measures humidity, a different parameter. 902520 Barometers: 902520 measures atmospheric pressure, not humidity; a vehicle-mounted hygrometer measures humidity, with a different principle and use. 902580 Other instruments: This code is 902580, but care must be taken to distinguish it from other subheadings, e.g., 9025.80 includes hygrometers, density meters, etc. 870829 Vehicle parts: 870829 is vehicle parts and accessories, but a hygrometer is an independent instrument and is not a structural or operational necessity part of a vehicle. Is the product used to measure humidity? Is it independent of other vehicle systems? Is it combined with a thermometer or barometer? Does it have a recording function? Is it specifically for vehicles?

Why is a vehicle-mounted hygrometer classified under 902580 instead of 8708? Because a vehicle-mounted hygrometer is an independent instrument for measuring humidity and conforms to the text of heading 9025. 8708 is for vehicle parts, but a hygrometer is not a structural or functional part necessary for vehicle operation, but an additional measuring device. According to the General Rules of Interpretation, it should be classified according to its main function, so it is classified under 9025. If a vehicle-mounted hygrometer has a temperature display, how should it be classified? If the hygrometer is combined with a thermometer and temperature measurement is the main function, it may be classified under 9025.19 (other thermometers); if humidity measurement is the main function, it is still classified under 9025.80. It must be judged according to the main function, and a detailed description must be provided at declaration. How can I check the import tariff rate for 902580? Tariff rates change, so it is recommended to check the latest rates through the official website of the General Administration of Customs or the International Trade Single Window. You can also use an HS code query tool and enter 902580 to view the corresponding import tariff, VAT, etc. Note that different rules of origin may apply different agreement rates. Is it necessary to provide the working principle of the hygrometer at declaration? Yes, the working principle is an important basis for classification. For example, capacitive, resistive or psychrometric principles may affect the subheading judgment. At declaration, a brief description should be provided, avoiding vague wording such as "electronic". If a vehicle-mounted hygrometer has a data recording function, does the classification change? If it has a recording function, it may be regarded as a recording hygrometer, but 9025.80 already covers other hygrometers, including recording ones. However, it needs to be confirmed whether it falls under 9025.80; usually there is no separate subheading, and it is still classified under 9025.80. What should be noted when declaring a vehicle-mounted hygrometer sold via cross-border e-commerce? Pay attention to accurately declaring the product name, use, and working principle, and avoid misclassifying as vehicle parts. At the same time, confirm whether it contains a battery; if it contains a lithium battery, it must meet dangerous goods transportation requirements. The declared value should be truthful, avoiding under-declaration. What is the difference between 902580 and 902519? 902519 is other thermometers, measuring temperature; 902580 is other instruments, including hygrometers, density meters, etc. The core difference is the measured parameter: thermometers measure temperature, hygrometers measure humidity. If a vehicle-mounted hygrometer is an original factory accessory, is the classification different? Even if it is an original factory accessory, as long as its function is to independently measure humidity, it is still classified under 9025. However, if it is integrated with the vehicle control system and becomes a necessary part for vehicle operation, it may be classified under 8708. It must be judged according to the specific degree of integration.