Section 18 OPTICAL, PHOTOGRAPHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION , MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; M USICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 Optical, photographic, cinematographic measuring, checking, precision, medical o 90 25 Hydrometers and similar floating instruments, thermometers, pyrometers, baromete 90 25 80 Barometers, not combine with other instruments 90 25 80 10 Barometers, not combine with other instruments Commodity Code Description 90 25 80 10 00 - Other instruments