| Business | Phone |
| Testing Engineers Inc 2447 N Central Ave, Rockford 61101 | (815) 964-8030 |
| Gabriel Environmental Svc 7123 Cherryvale North Blvd, Rockford 61112 | (815) 332-8378 |
| Factory Standards Lab Inc 4462 11th St, Rockford 61109 | (773) 929-0771 |
| Map Research Technologies 630 N Church St 202, Rockford 61103 | (815) 961-9194 |