Vacuum Photomultiplier Tube PMT from Mexico
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.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• 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