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.

The testo 557 4 valve HVAC manifold with two NTC temperature probe inputs can measure superheat and subcooling at the same time, saving you time and increasing your productivity. This 4 valve HVAC refrigeration system analyzer has an easy-to-read backlit display and reads and indicates vacuum in inches of mercury from the built-in vacuum gauge. The 557 can perform leak tests on AC/R systems with temperature compensation, ensuring accurate results. It comes loaded with 40 refrigerant profiles, eliminating the need for PT charts. The testo 557 digital manifold has an easy-to-read backlit display and its rugged housing protects the analyzer from every-day wear and tear.