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 Surgicla Instruments and Apparatus; parts and AccesoriesThereof. 90 31 Measuring or checking instruments, appliances and machines, not specified or included elsewhere in this chapter; profile projectors 90 31 20 TEST BENCHES 90 31 20 00 TEST BENCHES Commodity Code Description 90 31 20 00 000 TEST BENCHES