| Business | Phone |
| Calright Instruments 2232 Verus St # D, San Diego 92154 | (619) 429-4545 |
| Electrolab 3459 El Cajon Blvd, San Diego 92104 | (619) 563-3517 |
| Advanced Test Equipment Corp 10401 Roselle St, San Diego 92121 | (858) 558-6500 |
| Alioa Electric 2777 Newton Ave, San Diego 92113 | (619) 232-7619 |
| Qed Systems Inc 1330 30th St # D, San Diego 92154 | (619) 424-3225 |
| Peter's Electronics 2608 National Ave, San Diego 92113 | (619) 232-1779 |
| D W Strickland & Assoc 2810 Canon St, San Diego 92106 | (858) 614-2030 |
| Data Check San Diego 92126 | (858) 578-0101 |
| Hi Tech Electronics 9550 Black Mountain Rd # E, San Diego 92126 | (858) 693-3031 |