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Testo 557

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The Testo 557 digital 4 way manifold is an easy to use instrument and an ideal tool for measurement work on refrigeration systems and heat pumps. It comprises two temperature compensated pressure sensors measuring high and low system pressure quickly and precisely. The unit can automatically calculate the associated temperatures and display the superheating and subcooling values. The manifold has a robust 4 way valve block with additional connection possibilities, for examplefor a vacuum pump or a refrigerant bottle to provide a considerable handling advantage and enable safe and efficient working in commissioning, service and maintenance.

The App integration via Bluetooth allows you to read off the measurement data on a Smartphone or tablet and you are also able to finalise and send the measurement report directly on site, allowing you to work more efficiently.


  • App integration via Bluetooth for fast and convenient monitoring and reporting on site
  • Refrigerant update in the instrument via App
  • 4-way valve block for fast and efficient
  • External vacuum probe supports evacuation of the system with highly precise measurement
  • 250 hours battery life


For full technical details, please see the data sheet.

Operating temperature -10 to +50 °C

Storage temperature -20 to +60 °C

Battery life 250 hours (without illumination, without Bluetooth, without vacuum probe)

Compatibility requires iOS 7.1 or newer / Android 4.3 or newer - requires mobile end device with Bluetooth 4.0

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Testo 557 digital 4 way refrigerant manifold user manual.pdf Testo 557 digital 4 way refrigerant manifold user manual
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