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Vacuum gauge

High-precision vacuum measurement is an absolute must when it comes to the evacuation of heat pumps, air conditioning and refrigeration systems. Vacuum gauges which enable remote monitoring via smartphone and tablet are becoming increasingly popular in this area.

What is a Testo vacuum gauge capable of? Everything!

Testo's vacuum gauges are not only first class in technical terms, but also practical to use. Because high-precision measuring values are one key issue – a smooth work process is the other. A Testo vacuum gauge therefore offers you the following:

  • All the values you want to know for the reliable evacuation of heat pumps or refrigeration systems. High precision.

  • A robust, water and dust-resistant housing which is always there for you.

  • Optical alarm and a luminous display.

  • A digital vacuum gauge with Bluetooth testo Smart App: for smart vacuum measurement via smartphone/tablet.

Classic gauge or manifold?

Evacuate systems safely: Here you will find your ideal measuring device for vacuum.

Practical guide

Refrigeration knowledge in three modules

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Understanding refrigeration systems

Evaluating refrigerants


Main components of the compression refrigeration circuit

Subcooling / Superheating

And much more ...

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Vacuum measurement – this is how to do it:

It is self-evident (for us at Testo) that a vacuum gauge provides values of the highest possible precision. But that's not enough. Because it is not just the low pressures, but also above all the small details that make the evacuation of refrigeration systems or heat pumps smooth in the first place. And these are what will make you happy, at the latest when you start the vacuum measurement. They include:

Relaxed measurement even under time pressure: with good tips and the right vacuum gauge

Vacuum measurement involves very low pressures and thus extremely small forces. A quick reminder: pressure is the force exerted by gas molecules on the vessel wall – in more precise terms, their impacts. The lower the pressure falls, the finer the mechanisms have to be, with appropriate sophistication of the instrument technology, in order to be able to measure these fine effects. However, even a high-precision vacuum gauge from the market leader Testo will become even more precise if you take on board the following tips for vacuum measurement:

Vacuum measurement – what it's all about

When commissioning heat pumps, air conditioning and refrigeration systems, vacuum gauges are used, always in conjunction with a vacuum pump that creates the vacuum in the system. In this respect, your vacuum gauge should always meet the following requirements:

  • Pressure sensor with a high level of accuracy in the lower measuring range (e.g. a Pirani probe).

  • Wireless monitoring of absolute pressure.

  • Measurement of the evaporation temperature of H₂O.

  • Optical alarm when a limit value is exceeded.

Do you already have a vacuum gauge?

A manifold is the perfect addition.

Testo is always working flat out to develop the perfect measuring instrument for everything that can be measured as well. "Be sure" – you can be sure – we promise you, and by this we do not just mean the precision of our vacuum gauges. But also that you will find exactly the right measuring instrument for you to deal with every measuring task in industry, research, technology and trade.

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

Find out more


Compatible with all Bluetooth-enabled Testo measuring instruments


Direct report dispatch by e-mail


All measurement values at a glance


Intuitive measurement menus


Free download, free use


PRO measuring programs