8540.89.00/Photomultiplier Tube (PMT)/Japan

Photomultiplier Tube (PMT) from Japan

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 — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

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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)