| Business | Phone |
| S A Instruments Inc 10700 Richmond Ave, Houston 77042 | (713) 977-0968 |
| A Metek Process Analytical Div 9750 Whithorn Dr, Houston 77095 | (281) 463-4849 |
| Ametek Process Analytical Div 9750 Whithorn Dr, Houston 77095 | (281) 463-2820 |
| Analytical Systems Intl 21175 State Highway 249, Houston 77070 | (281) 351-8925 |
| Applied Nano Fluorescence Llc 2472 Bolsover St, Houston 77005 | (713) 521-1450 |
| Calcon Analytical Inc 17047 El Camino Real 100, Houston 77058 | (281) 280-8259 |
| Custom Crafting 223 E 11th St, Houston 77008 | (713) 861-4636 |
| Haygor Instrument & Engnrng Co 6322 Nunn St, Houston 77087 | (713) 641-1791 |
| Leco Corp 600 Kenrick Dr, Houston 77060 | (281) 931-0000 |
| Kassco 2715 Shadowdale Dr, Houston 77043 | (713) 460-4357 |
| Innovative Instrumentation Svc 1605 Community, Houston 77017 | (713) 475-9648 |
| Johnny's Gauge & Meter Repair 718 Dunwoody Dr, Houston 77076 | (713) 695-1038 |
| Land Sea & Sky Inc 3110 S Shepherd Dr, Houston 77098 | (713) 529-3551 |
| Nordman Instruments Inc 8707 Schumacher Ln, Houston 77063 | (713) 784-4185 |