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Testo 552 | Vacuum gauge

Contact Instrument Solutions

The Testo 552 is a digital vacuum gauge for the evacuation of heat pumps and refrigeration systems. This instrument delivers highly accurate information about a system's degree of dehumidification (sublimation temperature).

The 552 is the only digital vacuum measuring instrument whose absolute pressure sensor, in contrast to other sensor technologies, no longer needs to be serviced, and still provides highly accurate measurement results. With a battery life of up to 2400 hours with two conventional AA batteries, you can use the instrument in continuous operation for 100 days without the need to change. Its robust construction makes it suitable for daily use, and protects from dirt and water.


  • Battery life of up to 2,400 hours (100 days) on two AA sized batteries
  • Maintenance free absolute pressure sensor
  • Measures evaporation temperature of water
  • Audible alarm when a limit value is exceeded
  • IP 42 water and dirt resistant
  • Now with Bluetooth connection for wireless monitoring of measurement results via the testo Smart Probes App.


Vacuum measuring range 1100 - 0 mbar / 825080 - 0 micron

Sensor overload absolute 6 bar / 87 psi (relative: 5 bar / 72 psi)

Vacuum resolution 0.01 hPa / 10 micron

Vacuum accuracy:

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

Measurement parameters  mmHg, Torr, mbar, hPa, micron, inH20, inHg, Pa

Battery life 2,400 h (2x AA), (approx. 130 h with background illumination activated)

Connections 2x 7/16“ UNF / 1x Mini Din (testo 570)

Warranty 2 years

Demonstration video

Testo 552 digital vacuum gauge overview
Testo 552i | Vacuum probe
Testo 552i | Vacuum probe
Available to purchase from Instrument Solutions is the Testo 552i wireless vacuum smart probe which can automatically connect to instruments such as the Testo refrigeration manifolds.

Support documents

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Testo 552 vacuum gauge data sheet.pdf Testo 552 vacuum gauge data sheet
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