S-20 Photocathode Spectral Response Tube from Mexico
An S-20 spectral response photocathode tube optimized for extended red and UV-visible light detection, commonly used in photomultipliers and image converters for analytical instruments. It is classified under tariff item 8540.20.00 as a photo-cathode tube because the S-20 photocathode determines its spectral sensitivity, and it is used in applications like spectroscopy and low-light detection.
Duty Rate — Mexico → Canada
Import Tips
• Specify the S-20 photocathode type and spectral response range on the commercial invoice to support classification under 8540.20.00
• If the tube is part of a larger analytical instrument, consider classifying the complete instrument under Chapter 90
• Verify whether the tube is subject to end-use certificates for scientific research purposes to claim reduced duty rates