| 004 | APC-3.5 (f) connectors |
| C01 | Limits operation to 0-50 dB in 10 dB steps |
| R-50C-011-3 | Agilent Calibration - 3 years |
| R-50C-011-5 | Agilent Calibration - 5 years |
| R-50C-021-3 | ANSI Z540-1-1994 Calibration - 3 years |
| R-50C-021-5 | ANSI Z540-1-1994 Calibration - 5 years |
| UK6 | Commercial cal. certificate w/test data |