Chapter 90 covers optical, photographic, cinematographic, measuring, checking, medical or surgical instruments and apparatus, precision instruments and apparatus; parts and accessories thereof. The core feature of this chapter is that the goods are characterized by high precision and technology-intensive features, used in professional fields such as measurement, analysis, control, and medical treatment. When classifying under HS, the focus should be on the functional principle rather than the material, and the classification of parts must follow the principle of "solely or principally used." Heading 9027 covers various physical and chemical analysis instruments and apparatus, such as chromatographs, spectrometers, spectrophotometers, gas or smoke analyzers, electronic measuring devices, etc.; it also includes instruments for measuring or checking physical quantities such as viscosity, porosity, expansion rate, and surface tension. Goods under this heading are usually used in laboratories, industrial process control, or environmental monitoring, and their core function is quantitative analysis of the composition or physical properties of substances. Code 902790 is a six-digit subheading. The first 2 digits "90" represent Chapter 90 (optical, measuring, medical, etc. instruments). Digits 3-4 "27" represent heading 9027 (physical and chemical analysis instruments). Digits 5-6 "90" represent subheading 902790, namely parts and accessories of physical and chemical analysis instruments and apparatus not elsewhere specified or included, "other." Note: There are already multiple specific subheadings under 9027 (such as 902710 gas analyzers, 902720 chromatographs, etc.), and 902790 is a residual subheading covering parts of instruments not included in the above specific subheadings. Parts of vehicle-mounted analyzers are solely used for vehicle-mounted analyzers (which belong to physical and chemical analysis instruments under heading 9027), and are not specifically named in 902710-902780, so they are classified under 902790. They cannot be classified under 902730 (spectrometers, etc.) or 902750 (other optical instruments), because vehicle-mounted analyzers are usually based on non-optical principles such as electrochemistry and infrared; nor can they be classified under general parts codes other than 902790 (such as 8548), because they are solely used for 9027 equipment.
Chapter
Chapter 90 covers optical, photographic, cinematographic, measuring, checking, medical or surgical instruments and apparatus, precision instruments and apparatus; parts and accessories thereof. The core feature of this chapter is that the goods are characterized by high precision and technology-intensive features, used in professional fields such as measurement, analysis, control, and medical treatment. When classifying under HS, the focus should be on the functional principle rather than the material, and the classification of parts must follow the principle of "solely or principally used."
Heading
Heading 9027 covers various physical and chemical analysis instruments and apparatus, such as chromatographs, spectrometers, spectrophotometers, gas or smoke analyzers, electronic measuring devices, etc.; it also includes instruments for measuring or checking physical quantities such as viscosity, porosity, expansion rate, and surface tension. Goods under this heading are usually used in laboratories, industrial process control, or environmental monitoring, and their core function is quantitative analysis of the composition or physical properties of substances.
Digit Breakdown
Code 902790 is a six-digit subheading. The first 2 digits "90" represent Chapter 90 (optical, measuring, medical, etc. instruments). Digits 3-4 "27" represent heading 9027 (physical and chemical analysis instruments). Digits 5-6 "90" represent subheading 902790, namely parts and accessories of physical and chemical analysis instruments and apparatus not elsewhere specified or included, "other." Note: There are already multiple specific subheadings under 9027 (such as 902710 gas analyzers, 902720 chromatographs, etc.), and 902790 is a residual subheading covering parts of instruments not included in the above specific subheadings.
Classification Basis
Parts of vehicle-mounted analyzers are solely used for vehicle-mounted analyzers (which belong to physical and chemical analysis instruments under heading 9027), and are not specifically named in 902710-902780, so they are classified under 902790. They cannot be classified under 902730 (spectrometers, etc.) or 902750 (other optical instruments), because vehicle-mounted analyzers are usually based on non-optical principles such as electrochemistry and infrared; nor can they be classified under general parts codes other than 902790 (such as 8548), because they are solely used for 9027 equipment.
📝 Declaration Elements
Product Name: The specific name of the declared goods, which should include "parts of vehicle-mounted analyzers" and the specific part name, such as "sensor for vehicle-mounted exhaust gas analyzer." Use: Explain for which vehicle-mounted analyzer the part is solely used, for example, "used for vehicle-mounted exhaust gas analyzer to detect CO and HC concentrations." Brand: Declare the brand of the part (such as Bosch, Siemens); if there is no brand, fill in "no brand." Model: Fill in the specific model or number of the part to facilitate customs identification of uniqueness. Material: Main material composition, such as "stainless steel housing + ceramic sensing element." Working Principle: Briefly describe the functional principle of the part in the analyzer, such as "electrochemical sensor, generating a current signal through electrode reaction." Whether Solely Used for 9027 Equipment: Clarify whether the part is solely used for analytical instruments under heading 9027, answering "yes" or "no." Product name: Oxygen sensor for vehicle-mounted exhaust gas analyzer; Use: Solely used for vehicle-mounted exhaust gas analyzer to detect oxygen content in exhaust gas; Brand: Bosch; Model: LSU 4.9; Material: Zirconia ceramic + stainless steel housing; Working principle: Concentration cell principle, outputting a voltage signal; Whether solely used for 9027 equipment: Yes. Failure to clarify the "vehicle-mounted" use may lead to incorrect classification as general analyzer parts. If the part is a general electronic component (such as a resistor or capacitor), it may be classified under Chapter 85 rather than 902790. Failure to provide the working principle prevents customs from determining whether it belongs to analyzer parts under heading 9027.
Product Name
The specific name of the declared goods, which should include "parts of vehicle-mounted analyzers" and the specific part name, such as "sensor for vehicle-mounted exhaust gas analyzer."
⚠️ Writing only "analyzer parts" or "sensor" without clarifying the vehicle-mounted use and the type of analyzer.
Use
Explain for which vehicle-mounted analyzer the part is solely used, for example, "used for vehicle-mounted exhaust gas analyzer to detect CO and HC concentrations."
⚠️ The description of use is too broad, such as "used for analytical instruments," without reflecting the vehicle-mounted use and the type of analyzer.
Brand
Declare the brand of the part (such as Bosch, Siemens); if there is no brand, fill in "no brand."
⚠️ Confusing the brand with the brand of the complete machine, or omitting the brand, leading to classification disputes.
Model
Fill in the specific model or number of the part to facilitate customs identification of uniqueness.
⚠️ The model is incomplete or confused with the model of the complete machine.
Material
Main material composition, such as "stainless steel housing + ceramic sensing element."
⚠️ Writing only "metal" or "plastic" without specifying the key functional material.
Working Principle
Briefly describe the functional principle of the part in the analyzer, such as "electrochemical sensor, generating a current signal through electrode reaction."
⚠️ The description is too simple, such as "detects gas," without explaining the principle.
Whether Solely Used for 9027 Equipment
Clarify whether the part is solely used for analytical instruments under heading 9027, answering "yes" or "no."
⚠️ Failure to declare exclusivity, which may result in classification under a general parts code.
Example： Product name: Oxygen sensor for vehicle-mounted exhaust gas analyzer; Use: Solely used for vehicle-mounted exhaust gas analyzer to detect oxygen content in exhaust gas; Brand: Bosch; Model: LSU 4.9; Material: Zirconia ceramic + stainless steel housing; Working principle: Concentration cell principle, outputting a voltage signal; Whether solely used for 9027 equipment: Yes.
Common Mistakes：
Failure to clarify the "vehicle-mounted" use may lead to incorrect classification as general analyzer parts.
If the part is a general electronic component (such as a resistor or capacitor), it may be classified under Chapter 85 rather than 902790.
Failure to provide the working principle prevents customs from determining whether it belongs to analyzer parts under heading 9027.
🎯 Classification Logic
Core basis for classification: 1) Whether the part is solely or principally used for analytical instruments under heading 9027; 2) If it is solely used for a vehicle-mounted analyzer, and the vehicle-mounted analyzer itself is classified under 9027 (for example, an exhaust gas analyzer belongs to gas analyzers), then the part is classified under 902790; 3) If the part has an independent function or is of a general nature, it is classified under the corresponding parts code. Note: 902790 is a residual subheading, applicable only when the part is not specifically named in 902710-902780. 902710 Gas or smoke analyzers: 902710 is a complete machine code; if a complete vehicle-mounted gas analyzer is declared, it should be classified under 902710; if it is only a part, it is classified under 902790. 902730 Spectrometers, spectrophotometers, etc.: If the vehicle-mounted analyzer is based on the principle of spectroscopy, its parts may be classified under 902730; however, common vehicle-mounted analyzers are mostly based on electrochemistry or infrared, so their parts are classified under 902790. 902750 Other optical instruments: If the part is used for an analyzer based on optical principles (such as infrared spectroscopy), it may be classified under 902750; however, 902790 covers parts based on non-optical principles. 902790 Other analyzer parts: This code itself is a residual code, and attention must be paid to distinguishing it from parts of 902710-902780: if the complete machine is classified under a specific subheading, its parts are still classified under 902790 (unless there is a more specific parts subheading). 854890 Other electrical parts: If the part is a general electrical component (such as a connector or wiring harness) and is not solely used for analyzers, it should be classified under 854890; if it is solely used for analyzers, it is classified under 902790. Is the part solely used for analytical instruments under heading 9027? Is the complete analytical instrument classified under 9027? Is the part specifically named in 902710-902780? Does the part have an independent function or general applicability? Do the declaration elements fully describe the use, principle, and exclusivity?
Basis
Core basis for classification: 1) Whether the part is solely or principally used for analytical instruments under heading 9027; 2) If it is solely used for a vehicle-mounted analyzer, and the vehicle-mounted analyzer itself is classified under 9027 (for example, an exhaust gas analyzer belongs to gas analyzers), then the part is classified under 902790; 3) If the part has an independent function or is of a general nature, it is classified under the corresponding parts code. Note: 902790 is a residual subheading, applicable only when the part is not specifically named in 902710-902780.
Confused Codes：
902710 - Gas or smoke analyzers
902710 is a complete machine code; if a complete vehicle-mounted gas analyzer is declared, it should be classified under 902710; if it is only a part, it is classified under 902790.
902730 - Spectrometers, spectrophotometers, etc.
If the vehicle-mounted analyzer is based on the principle of spectroscopy, its parts may be classified under 902730; however, common vehicle-mounted analyzers are mostly based on electrochemistry or infrared, so their parts are classified under 902790.
902750 - Other optical instruments
If the part is used for an analyzer based on optical principles (such as infrared spectroscopy), it may be classified under 902750; however, 902790 covers parts based on non-optical principles.
902790 - Other analyzer parts
This code itself is a residual code, and attention must be paid to distinguishing it from parts of 902710-902780: if the complete machine is classified under a specific subheading, its parts are still classified under 902790 (unless there is a more specific parts subheading).
854890 - Other electrical parts
If the part is a general electrical component (such as a connector or wiring harness) and is not solely used for analyzers, it should be classified under 854890; if it is solely used for analyzers, it is classified under 902790.
Self-Check：
✓ Is the part solely used for analytical instruments under heading 9027?
✓ Is the complete analytical instrument classified under 9027?
✓ Is the part specifically named in 902710-902780?
✓ Does the part have an independent function or general applicability?
✓ Do the declaration elements fully describe the use, principle, and exclusivity?
❓ FAQ
Are parts of vehicle-mounted analyzers always classified under 902790? Not necessarily. The following conditions must be met at the same time: 1) The complete analyzer is classified under 9027; 2) The part is solely used for that analyzer; 3) The part is not specifically named in 902710-902780. If the part is a general-purpose part, it is classified according to the general parts code. How can it be determined whether a part is "solely used" for an analyzer? It is based on whether the design, structure, and function are only applicable to that analyzer. For example, if an oxygen sensor is solely used for an exhaust gas analyzer, exclusivity is established; if it is a general-purpose sensor that can be used in multiple devices, exclusivity is not established. What is the most error-prone aspect when declaring parts of vehicle-mounted analyzers? The most common error is failure to clarify the "vehicle-mounted" use and "solely used for analyzers," resulting in classification under a general parts code. In addition, an unclear description of the working principle can also lead to classification disputes. If the vehicle-mounted analyzer is a spectrometer, where are the parts classified? If the complete machine is a spectrometer (classified under 902730), its dedicated parts are still classified under 902790, because there is no specific parts subheading under 902730. However, note that if the part itself is an optical element (such as a lens), it may be classified under 9001, etc. What is the difference between 902790 and 902780? 902780 is "other physical and chemical analysis instruments," a complete machine code; 902790 is "parts of other physical and chemical analysis instruments," a parts code. The relationship between the two is that of complete machines and parts. How can the tariff rate for 902790 be checked? Through the official website of the General Administration of Customs, China International Trade Single Window, or third-party query platforms, enter HS code 902790 and information such as country of origin and trade mode to query the real-time tariff rate. Note that tariff rates are subject to policy adjustments. What should be noted when declaring parts of vehicle-mounted analyzers sold through cross-border e-commerce? It is necessary to accurately declare the product name, use, brand, model, and working principle, and provide proof that they are solely used for analyzers. If they are in retail packaging, attention must also be paid to whether they comply with the list of cross-border e-commerce retail imported goods. If the part is a circuit board for an analyzer, is it classified under 902790 or 8542? If the circuit board is solely used for an analyzer and is a main functional component, it is classified under 902790; if it is a general-purpose circuit board, it is classified under 8542. The key is whether it is solely used for 9027 equipment.
Q: Are parts of vehicle-mounted analyzers always classified under 902790?
A: Not necessarily. The following conditions must be met at the same time: 1) The complete analyzer is classified under 9027; 2) The part is solely used for that analyzer; 3) The part is not specifically named in 902710-902780. If the part is a general-purpose part, it is classified according to the general parts code.
Q: How can it be determined whether a part is "solely used" for an analyzer?
A: It is based on whether the design, structure, and function are only applicable to that analyzer. For example, if an oxygen sensor is solely used for an exhaust gas analyzer, exclusivity is established; if it is a general-purpose sensor that can be used in multiple devices, exclusivity is not established.
Q: What is the most error-prone aspect when declaring parts of vehicle-mounted analyzers?
A: The most common error is failure to clarify the "vehicle-mounted" use and "solely used for analyzers," resulting in classification under a general parts code. In addition, an unclear description of the working principle can also lead to classification disputes.
Q: If the vehicle-mounted analyzer is a spectrometer, where are the parts classified?
A: If the complete machine is a spectrometer (classified under 902730), its dedicated parts are still classified under 902790, because there is no specific parts subheading under 902730. However, note that if the part itself is an optical element (such as a lens), it may be classified under 9001, etc.
Q: What is the difference between 902790 and 902780?
A: 902780 is "other physical and chemical analysis instruments," a complete machine code; 902790 is "parts of other physical and chemical analysis instruments," a parts code. The relationship between the two is that of complete machines and parts.
Q: How can the tariff rate for 902790 be checked?
A: Through the official website of the General Administration of Customs, China International Trade Single Window, or third-party query platforms, enter HS code 902790 and information such as country of origin and trade mode to query the real-time tariff rate. Note that tariff rates are subject to policy adjustments.
Q: What should be noted when declaring parts of vehicle-mounted analyzers sold through cross-border e-commerce?
A: It is necessary to accurately declare the product name, use, brand, model, and working principle, and provide proof that they are solely used for analyzers. If they are in retail packaging, attention must also be paid to whether they comply with the list of cross-border e-commerce retail imported goods.
Q: If the part is a circuit board for an analyzer, is it classified under 902790 or 8542?
A: If the circuit board is solely used for an analyzer and is a main functional component, it is classified under 902790; if it is a general-purpose circuit board, it is classified under 8542. The key is whether it is solely used for 9027 equipment.
⚠️ Disclaimer: HS code classification, declaration elements, tariff rates and regulatory conditions on this page are for reference only and do not constitute legal advice on customs classification. Tariff rates and regulations are subject to change; the latest announcements from the General Administration of Customs and on-site determinations shall prevail. Please consult professional customs brokers or customs authorities before import/export.