| DUNCAN Series | Spectrol Series | NTE Series | Description |
| 70, 71 | 15-1-11 | 503-0001 | 1" Rectangular, 10-Turn, Digital Dial |
| 81 | 21-1-11 | 503-0006 | 1 13/16" Round, 15-Turn, Vernier Dial |
| 3203, 3253, 3223, 3232 | 534-1X-XXX | 502-0100 | 7/8" Dia., 3-Turn, Wirewound |
| 3204, 3205, 3206, 3256 | 533-1X-XXX | 502-0130 | 7/8" Dia., 3-Turn, Wirewound |
| 3253 | 536-11-XXX | 502-0115 | 7/8" Dia., 10-Turn, Wirewound |