testo 557 Digital Refrigeration Gauge with Vacuum probe

Rated 5/5 based on 2 reviews.


Key Features

 60 Built in refrigerants  

External vacuum probe for faster and more reliable evacuation of the system

4-way valve block with 1/4 in. and 3/8 in. ports

On-site Reporting/ Monitoring  Via Testo Refrigeration App  

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The testo 557 digital refrigeration gauge has a 4-way valve block, large backlit display and sight glass. Two NTC thermistor clamp probes provide superior accuracy of simultaneous, real-time superheat and sub-cooling readings. An external vacuum probe provides fast and more reliable evacuation of the system.

The wireless Bluetooth / App allows you to 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 reports and invoice via email, right from the job site.

In addition to the 60 refrigerant profiles stored in the instrument, the App can also be used to download new refrigerants from the Internet directly into the digital manifold.

Why Make the Switch from Analogue to Digital Gauges

60 built in refrigerants 

Measures high side / low side pressures and temperatures

4-way valve block with 1/4 in. and 3/8 in. ports

External vacuum probe

App integration via Bluetooth (65 feet range)


What’s included: Testo 557 kit, digital manifold with Bluetooth / App; including 2 x NTC temperature clamp probes, external vacuum probe, 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   


Vacuum Measurement 

Measuring range 0-10,000 Microns
Accuracy  -
Resolution 10 Microns 


Low Pressure Probe Measurement 

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



From Testo 550 to Testo 557

By: on 28 September 2017
I have been using the Testo 550 for quite some time now and It’s a fantastic piece of equipment. I have decided to upgrade to the new Testo 557, and I am looking forward to using this.

Well Worth the $$$

By: on 28 September 2017
Purchased the 557 to hopefully improve my time and efficiency when commissioning larger AC unit - This Gauge set is AWESOME - I cant believe it took me so long to get one!!! A MUST HAVE FOR ANY 'FRIDGY' that commissions up units!!!

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