Refrigeration technology

Electrical testing

Refrigeration and air conditioning systems along with heat pumps are electrical systems and are therefore subject to electrical testing in some cases. Whether this involves multimeters, clamp meters, current testers or voltage testers – thanks to innovative technologies and simplified application, Testo’s measuring instruments measure electrical parameters safely and precisely.

Electrical testing with the testo 770-3

Multimeters, clamp meters and voltage testers from Testo

  • testo 760 digital multimeter: Recognizes measurement parameters automatically

  • testo 770 clamp meter: Get a good grip on cables – even when things are tight

  • testo 750 voltage tester: Easy to read from any position

  • testo 755 current/voltage tester: A voltage tester that also measures current

  • testo 745 non-contact voltage tester: Filters high-frequency interference

testo Smart App

One App for all applications

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

Other applications

Adjusting and testing refrigeration systems

Manifolds and Smart Probes

Find out more

Refrigeration circuit control

Commissioning and service - fast, flexible and precise

Evacuating refrigeration systems

Vacuum gauges

Find out more

Evacuating/ vacuum measurement

Fully automatic evacuation and high-precision pressure measurement

Charging refrigeration systems

Refrigerant scales

Find out more

Charging

Automatic and precise charging according to target value

Detecting leaks in refrigeration systems

Leak detectors

Find out more

Leakage testing/tightness test

Reliable detection of the smallest leaks for all common refrigerants

Measuring temperature in refrigeration systems

Thermometers

Find out more

Temperature measurement

Flexible temperature measurement of components and ambient air

What’s new?

Measurement technology for heat pumps

With a digital manifold, you carry out the commissioning and servicing of heat pumps quickly, flexibly and precisely. The intuitive touchscreen, the clear visualization of the readings and the Bluetooth connection to the probes and testo Smart App all make measurement and documentation easier.

  • Pressure and temperature testing

  • Controlled refrigerant service

  • Easy tightness testing and evacuation

Carrying out measurements on heat pumps

All about refrigeration measuring technology

No results found.

The digital manifolds in use

With the testo 558s, the system density can be assessed easily and reliably, thanks to the clear visualization of pressure values and temperature compensation.

Thanks to the large colour display and wireless connection to the probes, all important parameters are visible at a glance. The 30-minute trend curves also ensure even more reliable analysis.

HVAC/R Magazine 02/2025

Free of charge, full of value.

Our latest HVAC/R magazine gives you insight into the most important technological trends in the industry – and the tools you need to stay ready for change. You’ll also find expert tips and real-world examples that help you work more efficiently with testo instruments.

Contact
Sensorcell Oy
Valimotie 13 A, 2nd floor
00380Helsinki
Finland
+358 (0)9 4282 7940

© 2026