Mercury Arc Light Sensor Tube from Mexico
Historical mercury arc photocell tube using mercury vapor photocathode for industrial light level monitoring in legacy automation systems. Provides switching function based on light threshold detection. Remains classified under HTS 8540.89.00.60 as vapor-filled light-sensing tube despite obsolescence.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• RoHS exemption documentation required due to mercury content
• Specify vapor pressure and arc characteristics to confirm vapor tube classification
• Safety data sheets mandatory for hazardous material declarations