Harmonized System Code Classification

The first two digits "90" represent optical, photographic, cinematographic, measuring, and testing instruments and related equipment.

Specifically, this category includes the following main products:

• Optical instruments: Including telescopes, microscopes, cameras, cinematographic cameras, projectors, prisms, lenses, filters, etc.
• Photographic equipment: Including film, photographic materials, photographic paper, developing equipment, etc.
• Measuring instruments: Including instruments for measuring length, weight, angle, temperature, pressure, flow, electricity, and other properties.
• Testing instruments: Including various standard parts, inspection instruments, calibration instruments, etc.
• Related equipment: Including parts, accessories, and maintenance tools for the above instruments.

Why classified under 90?

These products share the common characteristic of using optical principles, photographic techniques, or measurement techniques to acquire, process, and display information. They are mainly used in scientific research, industrial production, medical care, environmental protection, transportation, military, and other fields, playing an important role in improving production efficiency, ensuring product quality, and improving people's lives.

In summary, "90" represents a category of precision, professional, and high-technical-content instruments and equipment, whose core function is acquiring, processing, and displaying information.

The first four digits "9027": Instruments and devices for physical or chemical analysis (e.g., polarimeters, refractometers, spectrometers, gas or smoke analysis devices); instruments and devices for measuring or checking viscosity, porosity, expansion, surface tension, or similar properties; instruments and devices for measuring or checking heat, sound, or light intensity (including exposure meters); microtomes; their parts and accessories.

6-digit classification: Physical or chemical analysis instruments and devices

Specific meaning:

• Scope: Includes instruments and devices for physical or chemical analysis, such as polarimeters, refractometers, spectrometers, gas or smoke analysis equipment; instruments and devices for measuring or checking viscosity, porosity, expansion, surface tension, etc.; instruments and devices for measuring or checking heat, sound, or light intensity (including exposure meters); microtomes; and their parts and accessories.
• Subclassification: Specifically refers to other categories within gas or smoke analysis equipment.
• More detailed classification: Refers to other unspecified categories of gas or smoke analysis equipment.

8-10 digits explanation:
HS code: 9027106000
Classification: Instruments and devices for physical or chemical analysis (e.g., polarimeters, refractometers, spectrometers, gas or smoke analysis instruments); instruments and devices for measuring or checking viscosity, porosity, expansion, surface tension, or similar properties; instruments and devices for measuring or checking heat, sound, or light intensity (including exposure meters); microtomes; their parts and accessories: → Gas or smoke analysis instruments: → Other: → Other
Explanation: This HS code belongs to a specific subcategory of instruments and devices for physical or chemical analysis, more specifically referring to other categories of gas or smoke analysis instruments. It covers various instruments and devices used for measuring or analyzing gas or smoke, but not belonging to more specific subcategories.

Examples of products: * Gas analyzer * Smoke detector * Air quality monitor * Exhaust gas analyzer * Industrial gas measurement device * Environmental monitoring equipment for gas emissions