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The testo 557 Digital Manifold opens up new possibilities for efficient analysis and documentation thanks to the integration of Bluetooth connectivity with the testo Refrigeration App. You can clearly read measurement data, such as automatic calculations of superheat, sub-cool and vacuum readings, on a Smartphone or Tablet, allowing you to work more quickly and conveniently than ever before. In addition, measurement reports can be created and sent directly from the job site.The 557 features an external vacuum probe for faster and more reliable evacuations and is suitable for all refrigeration systems or heat pumps. This compact manifold has a 4-way valve block, large backlit display and sight glass. Two NTC thermistor clamp probes provide superior accuracy of simultaneous, real-time superheat and sub-cooling readings. With an optional 4 hose kit, the testo 557 is the complete solution for any air conditioning job you can throw at it.

  • 4-way valve block with 1/4 in. and 3/8 in. ports
  • External vacuum probe
  • Automatically calculates and displays Superheat and Sub-cooling temperatures
  • Bluetooth / App integration for monitoring, report generation, and sending reports and invoices via email
  • (4) 60in hoses included so you can get right to work

  • Testo 557 Digital Manifold
  • Bluetooth with App
  • (2) NTC Temperature Clamp Probes
  • External Vacuum Probe
  • (4) Hoses
  • Case
  • Batteries
  • Certificate of Conformity
  • User Manual
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Manuals (1)
Product Type:
Vacuum Sensor
Operating Temp Range:
-4° to 122°F
Measurement Range:
-58°F to 302°F
± 0.5%
Measurement Range:
-1 to +60 Bar
High Pressure Limit:
60 Bar
2 Years (Unregistered)
5 Years (Registered)
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