| N4431B-010 | Four 3.5 mm female module connectors | US$ | 0 |
| N4431B-020 | Four Type-N 50 ohm female module connectors | US$ | 0 |
| N4431B-101 | Port A connector is 3.5 mm female | US$ | 2,780 |
| N4431B-102 | Port A connector is 3.5 mm male | US$ | 2,780 |
| N4431B-103 | Port A connector is type-N 50-Ohm female | US$ | 2,780 |
| N4431B-104 | Port A connector is type-N 50-Ohm male | US$ | 2,780 |
| N4431B-105 | Port A connector is 7-16 female | US$ | 2,780 |
| N4431B-106 | Port A connector is 7-16 male | US$ | 2,780 |
| N4431B-150 | Wooden storage box | US$ | 168 |
| N4431B-1A7 | ISO 17025 compliant calibration | US$ | 336 |
| N4431B-201 | Port B connector is 3.5 mm female | US$ | 0 |
| N4431B-202 | Port B connector is 3.5 mm male | US$ | 0 |
| N4431B-203 | Port B connector is type-N 50-Ohm female | US$ | 0 |
| N4431B-204 | Port B connector is type-N 50-Ohm male | US$ | 0 |
| N4431B-205 | Port B connector is 7-16 female | US$ | 0 |
| N4431B-206 | Port B connector is 7-16 male | US$ | 0 |
| N4431B-301 | Port C connector is 3.5 mm female | US$ | 0 |
| N4431B-302 | Port C connector is 3.5 mm male | US$ | 0 |
| N4431B-303 | Port C connector is type-N 50-Ohm female | US$ | 0 |
| N4431B-304 | Port C connector is type-N 50-Ohm male | US$ | 0 |
| N4431B-305 | Port C connector is 7-16 female | US$ | 0 |
| N4431B-306 | Port C connector is 7-16 male | US$ | 0 |
| N4431B-401 | Port D connector is 3.5 mm female | US$ | 0 |
| N4431B-402 | Port D connector is 3.5 mm male | US$ | 0 |
| N4431B-403 | Port D connector is type-N 50-Ohm female | US$ | 0 |
| N4431B-404 | Port D connector is type-N 50-Ohm male | US$ | 0 |
| N4431B-405 | Port D connector is 7-16 female | US$ | 0 |
| N4431B-406 | Port D connector is 7-16 male | US$ | 0 |
| N4431B-A6J | ANSI Z540 compliant calibration | US$ | 336 |
| N4431B-UK6 | Commercial calibration certificate with test data | US$ | 573 |
