testo 552 - Vacuum Gauge 

Order-Nr.  0560 5520

  • 2,400 hours of battery power / 100 days of continuous operation 

  • Maintenance-free yet high-precision absolute pressure sensor 

  • Extremely precise, rugged, practical – with visual alarm / backlit display 

  • Measures pressure / calculates the  evaporation temperature of H2O automatically 

The Testo 552 is a high-precision digital vacuum gauge that has all the measuring functions you need for evacuating refrigerant systems and heat pumps. The rugged meter is built to last and tough enough to take the odd knock. 

Product Description

The Testo 552 is a high-precision digital vacuum gauge that has all the measuring functions you need for evacuating refrigerant systems and heat pumps. The rugged meter is built to last and tough enough to take the odd knock.

The Testo 552 is also the only vacuum gauge on the market with an absolute pressure senor which is maintenance-free yet still able to provide you with 100% reliable readings.

The Testo 552 vacuum gauge – areas of application

Evacuating is one of the most important steps when installing or restarting refrigerant or a/c systems: foreign gases, moisture and oils have to be removed properly. That’s when the absolute pressure of a system needs to be measured.

And that’s exactly what the Testo 552 digital vacuum gauge does: the meter provides you with highly accurate information on the dehumidification status of the system and measures even the smallest of absolute pressures reliably. This means that you are always able to observe manufacturer specifications. A visual alarm warns immediately when a threshold has been exceeded.

The IP42-rated Testo 552 has 2 400 hours’ worth of battery power for 100 days of continuous operation and is both water resistant and resistant to dirt. 


Absolute Pressure

Measuring range

1100 to 0 mbar /

825080 to 0 micron


0 to 1.33 hPa / 0 to 1000 micron : up to ±10 micron

0 to 200 hPa / 0 to 150000 micron : ±0.3% FS = ±0.6 hPa

200 to 1100 hPa / 150000 to 825080 micron : ±0.3% FS = ±3.3 hPa


0.01 hPa / 10 micron


absolute: 6.0 bar / 87 psi

(relative: 5.0 bar / 72 psi)

General technical data


250 x 165 x 55 mm

Operating temperature

-20 to +50 °C

Protection class


Battery type

2 AA

Battery life

2,400 h (approx. 130 h with backlighting activated)


2 x 7/16“ UNF; 1 x MiniDIN (connection to testo 570)


mbar; micron

Measuring rate

0.5 s

Storage temperature

-20 to +50 °C


500 g


MiniDIN connection cable

Order Number: 0554 5520

$37.40 incl Tax.

Complying with manufacturer's specifications

Some manufacturers specify exactly what the absolute pressure must be for you to evacuate your air conditioning systems how long this pressure must be maintained. Compliance with these specifications is simple and easy thanks to the flexible setting of the alarm threshold in the testo 552.

Documenting measurements

Via a Bluetooth interface, the testo 552 connects with the testo Smart Probes App on your smartphone or tablet. This allows you to monitor the absolute pressure reached during the evacuation conveniently and wirelessly. In addition to this, the measurement results can be quickly documented in the App and sent by e-mail.
When you use the testo 552 in combination with the testo 570 digital manifold, you can save the testo 552's measuring values or display them directly on a laptop via the optional EasyKool software.

Ensuring dehumidification

The testo 552 not only measures the pressure, but also gives the water evaporation temperature associated with it. In addition, it measures the ambient temperature and displays the temperature difference. This means you can quickly check whether the humidity in the system is evaporating and dehumidification is progressing properly.

Evacuating refrigeration systems

Using the testo 552, you can carry out evacuations of refrigeration systems quickly, flexibly and with a high level of accuracy.

Product Brochures



  • EasyKool software - update/demo for testo 570, 552, 560  (v4 SP4, EXE, 93.571 KB) (1) This is a demo version which will run 30 days on your computer. Within that time the software can be upgraded with a licence key to a full version.(2) The software runs with operating systems Microsoft Windows 7, Windows 8, Windows 10. (3) The software needs the > Microsoft .NET Framework 4.0. It has to be installed first if it is not already installed on your computer. The installation package can be downloaded from the Microsoft webpage.(4) This software supports the analyzers testo 556, testo 560 and testo 570(5) For your own security we recommend a backup of your data before running an update.