Testo External Vacuum Probe for Testo 557 Digital Manifold | 0638 1557 Refrigerant Gauges Manual ranging

Manual ranging

Temperature range is -20°C to 60°C — confirm suitability for your application

remaining flexible in cold conditions where vinyl leads become brittle

Fieldpiece ST4 Dual-Input Temperature Meter — T1

Testo External Vacuum Probe for Testo 557 Digital Manifold | 0638 1557 Refrigerant Gauges Manual rangingTesto 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,