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 25 HYDROMETERS AND SIMILAR FLOATING INSTRUMENTS, THERMOMETRES, PROMETERS, 90 25 90 PARTS AND ACCESSORIES FOR HYDROMETERS, THERMOMETERS, PYROMETERS,...ETC Commodity Code Description 90 25 90 00 PARTS AND ACCESSORIES FOR HYDROMETERS, THERMOMETERS, PYROMETERS,...ETC