| 9030.89 | 091 | - Spectrum analyzers |
| 9031.10 | 000 | Machines for balancing mechanical parts |
| 9031.20 | | Other optical instruments and appliances |
| 9031.80 | | - Of electrical type |
| 9031.90 | 010 | - Of electrical instruments and apparatus |
| 9032.10 | 010 | - Of electrical type |
| 9032.89 | 010 | - Of electrical type |
| 91.01 | | Wrist-watches, pocket-watches and other watches, including stop-watches, with case of precious metal or of metal clad with precious metal |
| 91.01 | | Wrist-watches, electrically operated, whether or not incorporating a stop-watch facility |
| 9101.11 | 000 | With mechanical display only |
| 9101.91 | 000 | Electrically operated |
| 91.02 | | Wrist-watches, electrically operated, whether or not incorporating a stop-watch facility |
| 9102.11 | 000 | With mechanical display only |
| 9102.91 | 000 | Electrically operated |
| 9103.10 | 000 | Electrically operated |
| 91.05 | | Alarm clocks |
| 9105.11 | 000 | Electrically operated |
| 9105.19 | | Wall clocks |
| 9105.21 | 000 | Electrically operated |
| 9105.91 | 000 | Electrically operated |
| 91.06 | | Time of day recording apparatus and apparatus for measuring, recording or otherwise indicating intervals of time, with clock or watch movement or with synchronous motor (for example, time-registers, time-recorders) |
| 91.08 | | Electrically operated |
| 9108.11 | 000 | With mechanical display only or with a device to which a mechanical display can be incorporated |