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, photographic, cinematographic, measuring, checking, precision, me Thereof. 90 25 Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, and any combination of these instruments 90 25 80 - - - Barometers, not combined with other instruments Commodity Code Description 90 25 80 10 - - - Barometers, not combined with other instruments 90 25 80 90 - - - Other