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Today's high-efficiency AC/R systems

need accurate charging to ensure

optimal performance. The Testo 550

delivers the accuracy and reliability

needed to calculate superheat and

subcooling, fast and easy.

With 40 refrigerant profiles and added

functionality of system pressure tests,

Testo manifolds are versatile to be

the tool of choice for every job


Real-time calculation of superheat & subcooling for

40 refrigerants

2-way aluminum valve block with 3 x 1/4" SAE connections

2 NTC temperature probe inputs

Built-in magnifying sight glass

Large, easy-to-read back-lit display

Rugged hook and housing for easy handling

Performs system-integrity leak tests

testo 550

Digital Manifold