The testo 557 4 valve HVAC manifold can simultaneously measure superheat and subcooling and is pre-loaded with 40 refrigerant profiles eliminiating the need for manual PT charts. The built-in vacuum gauge lets you know when you have reached the limits when evacuating a system.
Key Features:
- 4 valve HVAC manifold
- Real-time simultaneous superheat and subcooling
- Built-in vacuum gauge
- 40 refrigerant profiles for automatic PT calculations
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