Adjusting AC/refrigeration systems

The advent of digital technology means huge quality improvements when it comes to the adjustment of AC/refrigeration systems or heat pumps.

Digital manifolds provide high-precision temperature and pressure measurements, determine subcooling and superheating, but also enable reliable evacuation of the system through accurate vacuum measurement.

And the convenient testo AC/refrigeration App makes commissioning, maintenance or repair even quicker!

Everything at a glance.
In your hand.

Digital manifolds Testo

All the digital manifolds at a glance

One measuring instrument – all parameters

Commissioning, maintenance and/or repair? No matter where the focus of your work on AC/refrigeration systems and heat pumps is, Testo has the appropriate digital manifold for you.

Smart digital manifolds

The testo 550s and testo 557s digital manifolds including Bluetooth and 2- or 4-way valve block feature

  • large graphic display,
  • compact, rugged housing,
  • guided measurement menus and
  • the testo Smart App.


High-quality measurement technology, high level of reliability and clever functions for fast and easy measurement and documentation.

App-controlled digital manifold

The App-controlled testo 550i digital manifold

  • with Bluetooth,
  • 2-way valve block
  • and rugged hook
  • offers great measurement technology in especially compact format.
With the extremely robust manifold, you deal with your daily jobs on refrigeration systems wirelessly, easily and reliably. All with the testo Smart App on your smartphone or tablet.

Our recommendation for fast testing of a refrigeration system:

testo Smart Probes AC & refrigeration test kit

testo Smart Probes AC & refrigeration test kit

Perfect for testing

  • 2 high-pressure gauges (testo 549i) and 2 clamp thermometers (testo 115i)
  • Includes a testo Smart Case, with available spaces for additional testo Smart Probes
  • Operation with the testo Smart Probes App and your smartphone/tablet
  • Low refrigerant loss thanks to hoseless application
  • Over 80 refrigerants stored
  • Measuring ranges: -40 to 302°F; -1 to 60 bar

More measuring instruments for the refrigeration professional.

More measuring instruments for the refrigeration professional.

The digital manifold testo 557s in use