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 32 Automatic regulating or controlling instruments and apparatus Commodity Code Description 90 32 10 - Thermostats 90 32 20 - Manostats 90 32 81 - - Hydraulic or pneumatic 90 32 89 - - Other 90 32 90 - Parts and accessories