| Business | Phone |
| Advanced Calibrations Designs 2024 W Mcmillan St, Tucson 85705 | (520) 290-2855 |
| Breault Research Org Inc 6400 E Grant Rd, Tucson 85715 | (520) 721-0500 |
| Infrared Laboratories Inc 1808 E 17th St, Tucson 85719 | (520) 622-7074 |
| Zonge Engineering & Research 3322 E Fort Lowell Rd, Tucson 85716 | (520) 327-5501 |