Duochrome Test Slide Projector Optics from Canada
Red-green bichromatic optics balancing spherical refractive errors. HTS 9018.90.20.00 includes optical test projectors for sight-testing. Endpoint determination in subjective refraction.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Specify dominant wavelength values (red 625nm, green 535nm typical)
• Include projection lens focal length and screen illumination specs
• Classify as complete optical system vs. individual color filters