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Differential pressure measuring device

Testo offer a number of high-precision measuring instruments to determine differential pressure. The testo 510i Bluetooth manometer smart probe allows for differential pressure measurement on gas hot water heaters or on filters of air conditioning systems, and also flow measurements in ventilation ducts using a Pitot tube.

Differential pressure gauges from Testo - your advantages

  • Wide range on offer: differential pressure measuring instruments, differential pressure transmitters, probes and multifunction measuring instruments.

  • Perfectly designed: handy and robust with a large illuminated display. So that you can always keep an eye on the measuring values.

  • Versatile and practical: connections for probes to measure further parameters, along with optional accessories, from the practical handy bag to the TopSafe protective case.

Differential pressure gauge

Large selection from classic to smart.

Differential pressure gauge

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Tips & tricks

Carry out measuring tasks on heating systems efficiently and safely

Download the exclusive practical guide for free now.

To download

Checking the gas connection pressure

Setting the gas-air ratio

Preparing the flue gas analyzer

Determining the flue gas loss

Calculating the efficiency (η)

And much more ...

This is what you should pay attention to for differential pressure measurement

Each pressure measurement parameter relates to a reference pressure: with absolute pressure to vacuum, with relative pressure to the environment. When you measure differential pressure, you record the pressure difference between two values defined by you.

  • That is why a differential pressure measuring device always has two connections. Unlike an absolute pressure meter, which only needs one connection.

  • This means a differential pressure measuring instrument can also measure relative pressure.

  • Depending on the reference value, the measurement result can therefore be positive (+) or negative (-), that is indicating either an overpressure or a negative pressure.

Practical know-how for differential pressure measurement: how to do it even better

Whether it is correct use of the pressure gauge or optional accessories which make the measurement process easier in difficult-to-access or contaminated measurement environments – our practical tips in the field of differential pressure measurement enable you to avoid the most common application errors and to get maximum precision and performance from your measuring instrument!

How to make the best use of your differential pressure measuring instrument

Pressure measurement is not everything.

More measuring instruments from Testo

Whether you are servicing a ventilation system, want to commission a heating system or are responsible for compliance with cleanroom regulations and filter systems – you will find your ideal solution for every requirement at Testo.

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

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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