| Business | Phone |
| American Interplex Corp 6525 Melody Ln, Dallas 75231 | (214) 369-2532 |
| Rskcoih Lab 9742 Skillman St, Dallas 75243 | (214) 343-2025 |
| Matrix Analytical Laboratories 2307 Springlake Rd 500, Dallas 75234 | (972) 241-1314 |
| Quest Microanalytics 2530 Electronic Ln 712, Dallas 75220 | (214) 351-4441 |
| Severn Trent Labs 921 Forest Grove Dr, Dallas 75218 | (214) 660-0031 |