Parent chapter HS 90 - Optical, photographic, measuring, checking, precision and medical instruments Subheadings in this heading HS 903300Parts and accessories (not specified or included elsewhere in this Chapter) for machines, appliances, instruments or apparatus of Chapter 90. Final HS codes HS 90330000Parts and accessories (not specified or included elsewhere in this Chapter) for machines, appliances, instruments or apparatus of Chapter 90.