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, medical or surgical instruments and apparatus; parts and accessories thereof 90 18 Instruments and appliances used in medical, surgical, dental... 90 18 12 Ultrasonic scanning apparatus 90 18 12 00 Ultrasonic scanning apparatus Commodity Code Description 90 18 12 00 000 Ultrasonic scanning apparatus