Download the testo APP Refrigeration to your Smartphone / Tablet for free and make your everday work at AC/R Systems more comfortable.

• Remote view of your measured values on a Smartphone / Tablet
• Track changes using the graphical trending function
• Update the refrigerants in the instrument via the APP easily
• Create .pdf or .csv (Excel) reports
• Include a photo of the measuring location in the report
• Send out reports via e-mail directly
• Range of appr. 65 feet (unobstructed field) using Bluetooth Low Energy

The APP can only be used in combination with the manifold testo 550 or testo 557 (Generation 2015). The activation of the Bluetooth is carried out by pushing the up and down key on your manifold simultaniously. For working with the Smart Probes, please use the testo Smart Probes APP.

What’s New

Version 3.8.1

- New refrigerants R407H, R444B, R450A, R452B, R453a, R454A, R454B, R454C, R455A, R458A, R513A, R1233zd, SP22

Ratings and Reviews

3.4 out of 5
14 Ratings

14 Ratings

just a guy and his tools ,

Wrong readings.

On the App I can have my “list”reading at 24hg. While the next screen “ trending” will show it as 12psi. Need to be able to see same pressure read on both tables. Less confusing when talking to a customer and they see different numbers. Will give it 5 stars when fixed, to troublesome to use with customers.

Engineer Duprat ,

Testo 557

I have the Testo 557
I have been able to link to the Iphone reading the readings correctly but does not send the report via Gmail does not convert it to PDF

Developer Response ,

Please use there for Iphone typically Email account which you can find in your email setting at your Phone. I think Icloud, Yahoo and so on are supported. After this setting you can simply export your Measurement via Email. Your testo team!

Z-wave Supporter ,

Awesome tool

-select specific refrigerant to be stored on your 550 or equivalent
-datalog your HVAC system parameters and simultaneously display on graph for trend analysis

Very cool. FYI to all super techs out there: 550 uses class 3 Bluetooth which limits to 60ft unobstructed

Developer Response ,

Thank you for such a great and loyal Feedback! Best wishes your Testo Team.


Testo SE & Co. KGaA
60 MB

Requires iOS 7.1 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, German, Italian, Spanish

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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