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 30 HEADING 90.28; INSTRUMENTS AND APPARATUS FOR MEASURING OR DECTECTING 90 30 10 INSTRUMENTS AND APPARATUS FOR MEASURING OR DETECTING IRONIZING RADIATIONS Commodity Code Description 90 30 10 00 INSTRUMENTS AND APPARATUS FOR MEASURING OR DETECTING IRONIZING RADIATIONS