Photomultiplier Tube (PMT) from Mexico
Photomultiplier tubes convert weak light signals into electrical pulses through electron multiplication across multiple dynodes. Classified under HTS 8540.89.00 as photocathode tubes designed for photon detection in scientific instruments.
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
• Spectral response curves and quantum efficiency data essential for classification
• Clean room packaging required; contamination voids warranty and functionality
• Distinguish from image intensifier tubes under 8540.71 (TV camera tubes)