Temperature and humidity are both important test values during commissioning and also maintenance, for determining whether a refrigeration system or heat pump is in perfect condition.
The testo Smart App guides you quickly and easily through measurements on refrigeration, air conditioning and heating systems
Now new:
PRO measuring programs for increasing the efficiency of your applications
Multifunctional
Compatible with all Bluetooth-enabled Testo measuring instruments
Efficient
Direct report dispatch by e-mail
Fast
All measurement values at a glance
Easy
Intuitive measurement menus
Clever
Free download, free use
NEW
PRO Measuring Programs
At Testo, you’ll find the right measurement technology for a cost and energy efficient operation of heat pumps. You also make sure the environment isn’t burdened by any leaked refrigerant.
Pressure and temperature testing
Controlled refrigerant service
Easy tightness testing and evacuation
Download our exclusive practical guide now for free.
Understanding refrigeration systems
Evaluate refrigerants
Thermodynamics
Main components of the refrigeration cycle
Hypothermia/overheating
And much more ...
What I’d like to tell other technicians is that this instrument really saves a lot of time, and you don’t have to take that much stuff along, you’ve got less to do yourself because the testo 557s does everything for you.
Tom Siben
·Service technician at Lennox
We used to have to work with analog measuring instruments and needed a notepad, plus we needed external temperature probes. Testo has now incorporated all of that into one instrument. This makes it easier and much quicker for us to satisfy the customer with regard to the performance of their equipment.
Peter van Vliet
·Croonwolter&dros
My first impression is very positive; a very nice, new measuring set that you certainly won’t regret purchasing as a refrigeration technician. I don’t think any other brand can compete with it.
Marco Slump
·Owner of Slump Heating and Refrigeration Technology, Appingedam (NL)