Testo 552 Digital Vacuum Measuring Gauge

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  • Regular price $199.00


Testo 552 Digital Vacuum Measuring Gauge

The Testo 552 (part# 0560-5522) is a high accuracy, high resolution digital vacuum measuring instrument. In fact, the 552 is the most accurate HVACR vacuum gauge available for servicing heat pumps and refrigeration systems. Most vacuum gauges make use of thermistor technology to make their measurements, but thermistor measurement is very much subject to its environment. The Testo 552 uses an absolute pressure sensor, isolated from contaminating oils and refrigerants. This ensures accuracy regardless of contaminants, and even allows the instrument to be used in cold exterior conditions, down to 14 °F.

The new Testo 552 links to your smartphone or tablet via Bluetooth. Then you can use the free Testo Smart Probes App to display measurements, analyze operation, and create custom reports from this and many other Testo products. For Apple iOS and Android.

The Testo 552 features a robust rubberized housing that provides non-slip handling, and protects the instrument from dirt and water in rough environments. Finally, the Testo 552 can be connected via an optional cable to the Testo 570 Refrigeration System Analyzer to provide the 570 with the best vacuum measurements available. With all these features and an unbeatable accuracy, the Testo 552 is undoubtedly leading the way in refrigeration vacuum measurement.

Formerly as Testo part number 0560-5520 and 0560-5521.


  • Bluetooth
  • up to 1 micron resolution
  • Highly accurate and reliable measurement results
  • Maintenance free absolute pressure sensor
  • 50 hour battery life
  • Measurement of evaporation temperature H2O
  • Optical alarm when limit values are exceeded
  • Backlit display
  • 1/4" UNF (fine) hose connections
  • Extremely robust and resistant to water and dirt (IP42)

Warranty Information

The Testo 552 Digital Vacuum Measuring Gauge carries a 2-year warranty

Product Specs
Vacuum Measuring Range 0 to 26.66 mbar (0 to 20000 micron)
Vacuum Accuracy ±(10 micron + 10% of reading)
Vacuum Resolution 1 micron (0 to 1000 microns)
10 microns (1000 to 2000 microns)
100 microns (2000 to 5000 microns)
500 microns (5000 to 10000 microns)
5000 microns (10000 to 20000 microns)
Sensor Overload absolute: 87 psia (6 bar)
relative: 72 psig (5 bar)
Units mmHg, Torr, mbar, hPa, micron, inH20, inHg, Pa
Measuring Rate 0.5 seconds
requires iOS 8.3 (or later) / Android 4.3 (or later)
requires mobile device with Bluetooth 4.0
Operating Temperature 14 to 122 °F (-10 to 50 °C)
Storage Temperature -4 to 122 °F (-20 to 50 °C)
Battery Type 2 x AA batteries
Battery Life 50 hours (without Bluetooth/backlighting)
Protection Class IP42
Connection 2 x 7/16" UNF (1/4" SAE)
1 x mini-DIN (connection to Testo 570)
Dimensions 9.8 x 6.5 x 2.2 in (250 x 165 x 55 mm)
Weight 1.1 lbs (500 g)
  • Testo 552 Digital Vacuum Measuring Gauge
  • Two AA batteries
  • Calibration certificate

Free Shipping


Our policy lasts 30 days. If 30 days have gone by since you received purchase, unfortunately we can’t offer you a refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.