Digital Vacuum Gauge


Digital vacuum gauge with Bluetooth®

Extremely precise, rugged and practical: the testo 552 digital vacuum gauge. Ideal for evacuating refrigerant systems or heat pumps.


  • Measurement data monitoring via testo Smart App
  • Measurement data dispatch via testo Smart App
  • Extremely precise, extremely rugged, extremely practical – with visual alarm and backlit display
  • Measures pressure and calculates the evaporation temperature of H2O automatically


The testo 552 is a high-precision digital vacuum gauge designed to provide you with absolutely reliable readings. It has all the measuring functions you need for evacuating refrigerant systems and heat pumps and is built to last and tough enough to take the odd knock.Via a Bluetooth interface, the testo 552 connects with the testo Smart 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.

The testo 552 digital vacuum gauge – areas of application

Evacuating is one of the most important steps when it comes to installing or restarting refrigerant or air conditioning 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 is designed to do: the meter provides you with highly accurate information regarding the dehumidification status of the system and is able to measure even the smallest of absolute pressures absolutely reliably. This means that you are always able to observe manufacturer specifications. A visual alarm warns immediately when a threshold has been exceeded.
And because the digital vacuum gauge is IP42 rated (water resistant and dirt proof), it is virtually impervious to moisture and dirt.


testo 552 digital vacuum gauge with Bluetooth®, two AA batteries.

Absolute Pressure

Measuring range
0 to 26.66 mbar /
0 to 20000 micron
±(10 micron + 10 % of mv) (100 to 1000 micron)
100 micron (2000 to 5000 micron) /
1 micron (0 to 1000 micron) /
10 micron (1000 to 2000 micron) /
absolute: 6.0 bar / 87 psi
(relative: 5.0 bar / 72 psi)

General technical data

500 g
160 x 110 x 50 mm
Operating temperature
-10 to +50 °C
Protection class
System requirements
requires iOS 11.0 or newer; requires Android 6.0 or newer; requires mobile end device with Bluetooth 4.0
Product colour
Battery type
2 AA
Battery life
50 hrs (without Bluetooth/backlighting)
2 x 7/16“ UNF
Bluetooth® 4.0 wireless technology
mbar; micron; mmHg; Torr; inHg; inH20; hPa; Pa
Measuring rate
0.5 s
Storage temperature
-20 to +50 °C

You may also like…