ALTERNATIVELESS efficient flue gas measurement

With up to 4 wireless Smart Probes at the same time: the testo 300 NEXT LEVEL.

Why make measurements complicated when you can keep them simple?

Efficient, wireless measurement of up to four additional parameters in parallel via our Smart Probes - thanks to the new testo 300 NEXT LEVEL! Featuring a practical second screen and intuitive operation – it really couldn’t be easier.

When it comes to efficiency, there’s no alternative: Measure smarter, work easier

Save valuable time: with easy, intuitive documentation on site, send measurement data by e-mail via the testo Smart App and wireless Smart Probes. Also discover the benefits of easy data integration into your in-house software – fewer transmission errors, less paperwork, less stress.

BLUETOOTH® CONNECTOR*: 4 measurements in parallel via wireless Smart Probes

*Compatible with your previous testo 300

SECOND SCREEN FUNCTION and easy documentation via testo Smart App

SMART-TOUCH DISPLAY: intuitive and responsive

QR code scanner

Robust workmanship

For fast, simple and smart measurements, there’s no alternative: testo 300 NEXT LEVEL

The daily work routine is becoming more and more demanding. Time is getting scarcer, while processes are becoming more complex. However, on the other hand, some things unfortunately don’t change: Instrument operation and documentation are both cumbersome and time-consuming. But it doesn’t have to be that way! See for yourself!

See for yourself and hear a user’s voice:

The testo 300 NEXT LEVEL makes work much easier! You save a lot of time with the new smart functions, such as parallel measurement, second screen and sending the measurement data by e-mail. If I were to award a company for its innovative products that really make a difference - it would be Testo! That's when you notice that people are thinking about it. This makes work fun!

Karl-Heinz Bilz


Plumbing and heating foreman, Nidderau

Our bestseller-sets

testo Smart App

Welcome to the testo Smart World: The whole world in one app.

Faster, easier, smarter: The testo Smart app brings all the tools and measurements together - and the documentation can also be easily controlled using a smartphone or tablet. Benefit from intelligent connectivity and the unique all-in-one solution for all applications. So that not only the jobs on all heating systems are carried out smartly and effortlessly.

Find out more

You can easily connect these Smart Probes to the testo 300 NEXT LEVEL


Brochure testo 300 NEXT LEVEL


Brochure heating trade