- Testo
- Fluke
- Fieldpiece
- Yellow Jacket
- Mastercool
- Emerson Climate Technologies (formerly Alco Controls)
- Danfoss
- Sporlan
- Parker Hannifin
- Refrigerant Recovery (R.E. Michelson)
These brands are known for their reliability, accuracy, and durability, and they offer a wide range of gauge manifolds for different applications.