| psc | description |
| •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• | |
| 6605 | Navigational instruments |
| 6610 | Flight instruments |
| 6615 | Auto pilot mechanisms & airborne gyro components |
| 6620 | Engine instruments |
| 6625 | Electrical & electronic measuring measuring & testing instruments |
| 6630 | Chemical analysis instruments |
| 6635 | Physical properties testing & inspection |
| 6636 | Environmental chambers & related equipment |
| 6640 | Laboratory equipment & supplies |
| 6645 | Time measuring instruments |
| 6650 | Optical instruments, test equipment, components & accessories |
| 6655 | Geophysical instruments |
| 6660 | Meteorological instruments & apparatus |
| 6665 | Hazard-detecting instruments & apparatus |
| 6670 | Scales & balances |
| 6675 | Drafting, surveying & mapping instruments |
| 6680 | Liquid & gas flow, liquid level & mechanical motion measuring instruments |
| 6685 | Pressure, temperature & humidity measuring & controlling instruments |
| 6695 | Combination & miscellaneous instruments |
