Proportional Counter Gas Tube from China
Proportional counters use gas multiplication for precise radiation spectroscopy in nuclear physics. The gas amplification region creates proportional charge pulses, fitting HTS 8540.89.0020 as gas electron tubes.
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
• Window material (mica typical) and gas gain specs required for declaration
• Nuclear regulatory documentation often needed for physics research imports
• Distinguish from sealed detectors by providing operating principle docs