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 26 LEVEL GAUGES, MANOMETERS, HEAT METERS). EXCLUDING INSTRUMENTS AND 90 26 90 PARTS AND ACCESSORIES FOR INSTRUMENTS & APPARATUS FOR MEASURING/CHECKING.. Commodity Code Description 90 26 90 00 PARTS AND ACCESSORIES FOR INSTRUMENTS & APPARATUS FOR MEASURING/CHECKING..