| Business | Phone |
| A & E Microscope Sales & Svc 7706 Lakewind St, Houston 77061 | (713) 643-7943 |
| Carl Zeiss Instrument Inc 9126 Devoncroft Dr, Houston 77031 | (713) 772-5666 |
| Crg Precision Electronics 8704 Haverstock Dr, Houston 77031 | (713) 271-9423 |
| Meyer Instruments Inc 1304 Langham Creek Dr 235, Houston 77084 | (281) 579-0342 |
| National Sem Svc 10203 Foreman St, Houston 77017 | (713) 473-0622 |