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 32 AUTOMATIC REGULATING OR CONTROLLING INSTRUMENTS AND APPARATUS. 90 32 90 PARTS AND ACCESSORIES FOR AUTOMATIC REGULATING/CONTROLLING INST. & APP.... Commodity Code Description 90 32 90 00 PARTS AND ACCESSORIES FOR AUTOMATIC REGULATING/CONTROLLING INST. & APP....