Section XVIII — Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; clocks and watches; musical instruments; parts and accessories thereof
Chapter 90 — Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; parts and accessories thereof
Heading
9002 Lenses, prisms, mirrors and other optical elements, of any material, mounted, being parts of or fittings for instruments or apparatus, other than such elements of glass not optically worked.
Common commodities
Mounted precision objective lensesGround and polished mounted eyepiecesOptical filters in permanent supportInstrument-fit optical prism assembliesPrecision-mounted dichroic filtersMounted achromatic lens systemsBarium crown mounted lensesFused silica mounted high-power lensZinc selenide mounted optical prismMounted barium fluoride optical elements