testo 550 Refrigeration Gauge


Key Features 

60 Built in refrigerants 

-1 to 60 Bar Pressure 

Automatic Calculation of SuperHeat & SubCool Temperatures

On-site Reporting/ Monitoring Via Testo Refrigeration App

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The testo 550 refrigeration gauges instantly displays superheat and sub-cooling for up to 60 refrigerants. It also measures high / low side pressures and temperatures. With its free Bluetooth linked App, the Testo 550 opens up new possibilities for efficient analysis and documentation

The rugged housing of the Testo 550 digital gauges includes a metal frame around the display which protects the digital manifold from impact. Now with 60 refrigerant profiles and added functionality for leak tests, the Testo 550 digital manifold is versatile enough to become the tool for every job. You can view measurement data on your Smartphone or Tablet, enabling you to quickly and conveniently complete and document your job.

Then, be able to finalize the documentation and send the report and invoice via email, right from the job site. The App can also be used to download new refrigerants from the Internet directly into the manifold.

Why Make the Switch from Analogue to Digital Gauges

Measures high side / low side pressures and temperatures and displays saturation and evaporation temperature

Bluetooth / App integration for monitoring, report generation, and sending reports and invoices via email (65 feet range)

2-way valve block with three connections

60 refrigerant profiles stored in the instrument

Simplified menu structure using ESC key

Automatic superheat and sub-cooling calculations

What's included: Testo 550 kit, digital manifold with Bluetooth / App; including 2 x clamp probes, batteries, case, certificate of conformity, and user's manual.


Technical Data

Storage Temperature -20 to + 60°C
Operating temperature -10 to +50 °C
Battery type 4 AA batteries
Battery life 250 h (less with use Bluetooth & Backlit)
Dimensions 265 x 48 x 19 mm


Instrument Sensor 

Measuring range -50 to +150 °C 
Accuracy ±0.5 °C 
Resolution 0.1 °C / °F / °R 


Low Pressure Probe Measurement 

Measuring range -1 to 60 bar
Accuracy ±0.5 % fs
Resolution 0.1 psi (0.01 bar)
Overload  65 bar



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