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 24 MACHINES AND APPLIANCES FOR TESTING THE HARDNESS, STRENGTH, 90 24 80 OTHER MACHINES AND APPLIANCES FOR TESTING THE HARDNESS/STRENGTH/COMPRESS.. Commodity Code Description 90 24 80 00 OTHER MACHINES AND APPLIANCES FOR TESTING THE HARDNESS/STRENGTH/COMPRESS..