| 001 | Rear panel input and output connectors |
| 010 | Left position 400 Hz high pass filter |
| 011 | Left position CCITT weighting filter |
| 012 | Left position CCIR weighting filter |
| 013 | Left position C-Message weighting filter |
| 014 | Left position CCIR/ARM weighting filter |
| 015 | Left position "A" weighting filter |
| 050 | Right position 400 Hz high pass filter |
| 051 | Right position CCITT weighting filter |
| 052 | Right position CCIR weighting filter |
| 053 | Right position C-Message weighting filter |
| 054 | Right position CCIR/ARM weighting filter |
| 055 | Right position "A" weighting filter |
| 0D2 | Factory Refurbished Demo Equipment |
| 0Q8 | Factory Delivered Service Training |
| 907 | Front handle kit(5061-9689) |
| 908 | Rack Flange Kit for Use without Handles |
| 909 | Front Handle & Rack Flange Kit |
| 910 | Additional operating and service manual |
| 915 | Additional Service Manual |
| AB1 | Korea Quick Users Guide (Korean localization) |
| ABJ | Japan Quick Users Guide (Japanese localization) |
| ABZ | Italy Quick Users Guide (Italian localization) |
| RMKT | Agilent Refurbished Product (Do Not Use - Certiprime Option) |
| UK6 | Commercial calibration with test results data |
| W30 | Three year return repair service |
| W55 |