Frequency Counters
| EIP 351D | 20 Hz-18 Ghz, option 09 (BCD Output) | |
| HP 53131A | with option 030 (DC- 3 Ghz), mint condition | |
| HP 5335A | 0-1300 Mhz, options: 030 (C Channel, 1Ghz), 040 (HPIB) | |
| HP 5342A | .5-18 Ghz, options: 001 (high stability), 011 (HPIB) | |
| Leader LDC-824S | Digital Counter, 520 Mhz | ![]() |
| Opto Electronics 8010A | 1 Ghz | ![]() |
| Opto Electronics 8013 | 1.3 Ghz | ![]() |
| Trilithic TFC 600 | 600 Mhz | |
| Wavetek CM 1000 | 1 Ghz |

