Section 18 OPTICAL, PHOTOGRAPHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION, MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; MUSICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 OPTICAL, PHOTOGRAGHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION, MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; MUSICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 27 MEASURING OR CHECKING QUANTITIES OF HEAT, SOUND OR LIGHT (INCLUDING 90 27 30 SPECTROMETERS, SPECTROPHOTOMETERS & SPECTROGRAPHS USING OPTICAL RADIATIONS Commodity Code Description 90 27 30 00 SPECTROMETERS, SPECTROPHOTOMETERS & SPECTROGRAPHS USING OPTICAL RADIATIONS