Testo External Vacuum Probe for Testo 557 Digital Manifold | 0638 1557 Refrigerant Gauges AREAS OF APPLICATION FOR THE

AREAS OF APPLICATION FOR THE TESTO 625 HUMIDITY METER

R1234yf and R134a adapter fitting for cylinders

and Azeotropic

Manual ranging

Testo External Vacuum Probe for Testo 557 Digital Manifold | 0638 1557 Refrigerant Gauges AREAS OF APPLICATION FOR THETesto External Vacuum Probe for Testo 557 Digital Manifold 0638 1557 The Testo 0638 1557 is an external vacuum probe designed for use with the Testo 557 digital manifold, providing faster and more reliable evacuation measurements than the manifold's built in vacuum sensor. By placing the probe closer to the system being evacuated rather than measuring at the manifold you get a more accurate representation of the actual vacuum level in the system,