| Business | Phone |
| Fit Testing Svc 6254 Architrave St Se, Grand Rapids 49546 | (616) 464-1118 |
| Innodaq Test Solutions 2153 Wealthy St Se 326, Grand Rapids 49506 | (616) 956-3036 |
| Testing Machines Sales & Svc 114 Division Ave N, Grand Rapids 49503 | (616) 235-4304 |