Chapter 90 covers optical, photographic, cinematographic, measuring, checking, medical or surgical instruments and apparatus; precision instruments and apparatus; parts and accessories thereof. This chapter has a broad scope, ranging from simple magnifying glasses to complex electron microscopes, lasers, medical imaging equipment, etc. The core characteristic is that these goods are usually precision, technology-intensive, and used for professional purposes such as measurement, observation, inspection, and medical treatment, rather than ordinary consumer electronic products. Heading 9012 covers microscopes (optical microscopes, electron microscopes and proton microscopes) and diffraction apparatus. It includes all types of microscopes and their dedicated parts and accessories, such as objective lenses, eyepieces, stages, lens barrels, electron guns, detectors, etc. However, it should be noted that heading 9012 does not include magnifying glasses for non-microscopic uses (heading 9013) or ordinary lighting fixtures for microscopes (heading 9405). First 2 digits 90: indicates Chapter 90, covering optical, medical and other precision instruments. Digits 3-4: 12: indicates heading 9012, specifically microscopes and diffraction apparatus. Digits 5-6: 90: indicates subheading 901290, i.e., parts and accessories of other microscopes and diffraction apparatus. Note that under 9012 there are also 901210 (microscopes and diffraction apparatus) and 901290 (parts, accessories). Therefore, 901290 specifically refers to dedicated parts and accessories of microscopes or diffraction apparatus, not complete machines. This commodity is an accessory for a vehicle-mounted electron microscope, belonging to dedicated parts or accessories of electron microscopes. Since complete electron microscopes are classified under 901210, their dedicated accessories should be classified under 901290. They cannot be classified under 9013 (other optical instruments) or 9027 (physical or chemical analysis instruments), because accessories must be classified together with the main machine, and electron microscopes clearly fall within the scope of 9012.

Product name: The specific name of the declared commodity, which should accurately reflect the function or use of the accessory, such as 'sample stage for electron microscope' or 'detector for electron microscope'. Use: Explain what kind of equipment the accessory is suitable for, such as 'for vehicle-mounted electron microscope' or 'for scanning electron microscope'. Brand: Fill in the brand name of the accessory; if there is no brand, fill in 'no brand'. Model: Fill in the model or part number of the accessory so that it can be matched with the complete machine. Material: Main material, such as metal, plastic, glass, etc., which affects classification but is not decisive. Working principle: Briefly explain the role of the accessory in the electron microscope, such as 'used to focus the electron beam' or 'used to detect secondary electrons'. Whether dedicated: Declare whether the accessory is dedicated to electron microscopes or is a general-purpose part. Customs declaration example: Product name: Sample stage for electron microscope Use: For vehicle-mounted scanning electron microscope, to carry samples Brand: FEI Model: XYZ-123 Material: Aluminum alloy Working principle: Moves the sample through precision mechanics to cooperate with electron beam scanning Whether dedicated: Dedicated Remarks: This sample stage is a dedicated accessory for electron microscopes and cannot be used for other equipment. Mistakenly classifying electron microscope accessories under 9013 (other optical instruments), ignoring their dedicated nature. Declaring general-purpose accessories (such as standard screws) as dedicated accessories, leading to classification errors. Failure to provide sufficient information to prove that the accessory is dedicated to electron microscopes, triggering customs doubts.

Core criteria for classification: 1) whether the commodity is a dedicated part or accessory of an electron microscope; 2) whether it is used together with a complete electron microscope; 3) whether it has other independent functions. According to General Rules 1 and 6 for the interpretation of the HS, dedicated parts should be classified according to the main machine. Complete electron microscopes are classified under 901210, and their dedicated parts under 901290. If an accessory has an independent function (such as a lighting device with its own power supply), it may be classified under another heading. 901210 Microscopes and diffraction apparatus: 901210 is for complete microscopes, while 901290 is for their dedicated parts and accessories. If a complete electron microscope is imported, it should be classified under 901210; if it is only an accessory, it should be classified under 901290. 901390 Parts and accessories of other optical instruments and appliances: 901390 applies to parts of equipment under heading 9013, such as parts of magnifying glasses and optical telescopes. Electron microscope accessories are not classified here because electron microscopes belong to 9012. 902790 Parts and accessories of physical or chemical analysis instruments and apparatus: 902790 applies to parts of instruments under heading 9027 (such as spectrometers and chromatographs). Although electron microscopes can be used for analysis, they are clearly classified under 9012, so their accessories are not classified under 902790. 847990 Parts of machines with individual functions: 847990 applies to parts of machines under heading 8479. If electron microscope accessories are mistakenly regarded as parts of some kind of machine with individual functions, they may be incorrectly classified here. However, electron microscopes are optical instruments and should be classified under Chapter 90. Is it confirmed that the accessory is dedicated to electron microscopes? Is it declared together with the complete machine or clearly intended for the complete machine? Does it have independent functions and may therefore be classified under another heading? Is it a general-purpose part rather than a dedicated part? Have adjacent headings such as 9013 and 9027 been excluded?

Is there any difference in HS code between vehicle-mounted electron microscope accessories and ordinary electron microscope accessories? There is no difference. HS classification depends on the function and dedicated nature of the commodity, not the use scenario. A vehicle-mounted electron microscope is still an electron microscope, and its dedicated accessories are also classified under 901290. However, when declaring, the 'vehicle-mounted' use should be indicated so that customs understands the actual use. How can it be determined whether an accessory is a dedicated part or a general-purpose part? Dedicated parts refer to parts used only or mainly for electron microscopes, such as sample stages, electron guns, detectors, etc. General-purpose parts such as standard screws and ordinary cables, if they can be used for multiple types of equipment, should be classified according to their own material or function. It is recommended to provide technical documentation to prove dedicated nature. If electron microscope accessories are imported separately, are they still classified under 901290? Yes. According to the General Rules for classification, dedicated parts, even if imported separately, should be classified according to the main machine. However, it must be ensured that the accessory is indeed dedicated to electron microscopes and is not more specifically named in another heading. When importing accessories under 901290, what is the most critical declaration element? The most critical are 'Use' and 'Whether dedicated'. The use must clearly point to electron microscopes, and whether dedicated must be declared as a dedicated part. In addition, brand, model, working principle, etc. also help customs confirm classification. If an accessory can be used both for electron microscopes and for other optical instruments, how should it be classified? If an accessory can be used for multiple types of equipment, it is not a dedicated part and should be classified according to its own characteristics. For example, a general lens may be classified under 9001 or 9013. In this case, it should be judged according to the main use or function, and it is recommended to consult customs or obtain advance classification. Are there other regulatory conditions involved in the import of electron microscope accessories? Possibly. Electron microscopes and their accessories may be high-tech products involving export controls or import licenses. Specific customs regulatory conditions should be checked, such as whether an automatic import license is required and whether dual-use items are involved. It is recommended to confirm in advance. How can the specific tax rate under 901290 be checked? Tax rates may change. It is recommended to check the latest tax rates through the official website of the General Administration of Customs, China International Trade Single Window, or a professional customs declaration system. When checking, confirm the commodity code, country of origin, trade mode, etc., to obtain the accurate tax rate. What are the consequences of incorrectly classifying under 901210 during customs declaration? Incorrect classification may lead to failure of customs document review, supplementary tax payment, fines, or even administrative penalties. 901210 is for complete machines, and the tax rate and regulatory conditions may differ from 901290. It is recommended to declare truthfully and apply for advance classification when necessary.