Nanoparticle Deposition Monitor
A monitor that detects nanoparticle deposition and surface contamination on semiconductor wafers using condensation particle counting technology. It is critical for advanced node yield control and operates as an optical detection system. This falls under tariff item 9031.49.90 as an other optical measuring instrument.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the monitor measures non-optical particle properties
Non-optical measuring instruments are classified under other headings.
If the monitor is used for gas or smoke analysis
Gas analysis apparatus fall under heading 90.27.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Document the optical detection mechanism to support classification under 9031.49.90
• Consider whether the monitor qualifies for duty relief under programs for semiconductor manufacturing equipment
• Ensure the import declaration specifies the end-use in semiconductor fabrication to avoid misclassification
Related Products under Tariff item 9031.49.90
Autocollimator Optical Alignment System
The Autocollimator Optical Alignment System is a precision instrument measuring small angular deviations for machine tool alignment and optical testing. It is an electronic autocollimator used in metrology laboratories, fitting under tariff item 9031.49.90 as an 'Other' optical measuring instrument.
Chromatic Confocal Sensor
The Chromatic Confocal Sensor is a non-contact optical sensor using chromatic aberration for high-speed surface profiling and thickness measurement. It is an advanced optical measuring technology under tariff item 9031.49.90 for inline production monitoring.
Confocal Laser Scanning Gauge
The Confocal Laser Scanning Gauge is a point sensor using confocal laser scanning for precise distance and thickness measurement in production lines. It is an industrial optical measuring instrument under tariff item 9031.49.90 for automated quality control.
Conoscopic Holography Sensor
The Conoscopic Holography Sensor is a compact optical sensor using conoscopic holography for 3D surface profiling and vibration analysis. It is an advanced optical measuring instrument under tariff item 9031.49.90 for R&D and production metrology applications.
Digital Holographic Microscope
The Digital Holographic Microscope combines digital holography with microscopy for 3D quantitative imaging and surface metrology. It falls under tariff item 9031.49.90 when the measurement function predominates over microscopic observation.
DUV Mask Metrology Station
A deep ultraviolet metrology station used to measure chrome patterns, quartz thickness, and defectivity on DUV photomasks in semiconductor fabs. It is automated for high-volume inspection and relies on optical measurement techniques. This places it under tariff item 9031.49.90 as an other optical measuring or checking instrument.