| 024 | 24 Vdc without TTL logic |
| 100 | Solder terminals replace std cable conn. |
| 161 | 16-pin DIP with quantity one of ribbon cable, 24", with SMA female connectors |
| 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 |
| T24 | TTL and 5V CMOS compatibility |
| UK6 | Commercial cal. certificate w/ test data |