Vacuum Photodiode Tube from Mexico
S-4 response vacuum photodiode tube with Cs-O-Ag photocathode for UV light detection in spectrophotometers, featuring fast response time (<2ns) and high radiant sensitivity. Operates without electron multiplication for direct photocurrent generation. HTS 8540.89.00.60 covers this as a light-sensing vacuum tube with photocathode.
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
• Specify spectral response curve (160-650nm) to distinguish from semiconductor photodiodes
• Base material certificates required if containing controlled substances like cesium compounds
• Avoid packaging with optical mounts that could trigger instrument parts classification