The App for testo flow hood: mobile, flexible, efficient.

Install our free app on your smartphone / tablet and get the parctical functions around the volume flow measurment with the testo 420. The documentation and reporting of the results and the measurment in conjunction with the telescopic stand can be quickly and easily carried out.

- Display of the current measured values as well as carrying out measurments via smartphone / tablet
- Creation of .pdf and .csv (excel) reports
- Calculation of total volume flow and air exchange rate
- Insert comments and photo into the report documentation
- Sending reports directly via email
- Identify changes to the system through graphical trend display
- Communication range of about 65 feet via Bluetooth Low Energy.

The App can only be used together with testo 420.

What’s New

Version 3.9.0

This app has been updated by Apple to use the latest Apple signing certificate.

Optimization of the app view for iOS 11

Ratings and Reviews

4.0 out of 5
3 Ratings

3 Ratings

App Privacy

The developer, Testo SE & Co. KGaA, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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