Photomultiplier Tube (PMT) from China
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 — China → United States
41.2%
Rate breakdown
9903.88.0125%Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
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)