Vacuum Photomultiplier Tube PMT
A vacuum tube containing a photocathode that emits electrons when struck by photons, which are then multiplied to produce a measurable current. Classified under HTS 8540.89.00.80 as a photocathode tube not specifically covered by other subheadings in heading 8540. Used in scientific instruments like scintillation detectors.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when imported as part of scientific instrument
Parts of optical/analytical instruments may shift to Chapter 90 if proven integral to end-use apparatus.
If for use in laser systems
Photomultiplier tubes in laser detection assemblies can classify under laser parts in heading 9013.
If solid-state semiconductor version
Hybrid devices without true vacuum tube construction fall under semiconductor parts in Chapter 85 heading 8541.
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Import Tips & Compliance
• Verify tube specifications match photocathode or vacuum tube definitions in Chapter 85 notes to avoid reclassification
• Provide detailed technical datasheets showing vacuum construction and electron multiplication process for CBP review
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