# testo 420

> Mobile app for testo 420 flow hood measurements, documentation, and reporting. (iPhone/iPad app by Testo SE & Co. KGaA.)

- Source: https://appshunter.io/ios/app/testo-420/id1011111546 (this page in markdown: same URL + `.md`)
- Developer: [Testo SE & Co. KGaA](https://appshunter.io/developer/966489178)
- Category: Productivity
- Price: Free
- Rating: 4.00/5 from 3 App Store ratings
- Age rating: 4+
- Requires: iOS 7.1 · 56 MB
- Released: 2015-07-24
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/testo-420/id1011111546/reviews.md

## What is testo 420?

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. 

Features:
- 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.

## Key features

- Real-time measurement display
- PDF and CSV report creation
- Total volume flow calculation
- Comment and photo insertion
- Direct email report sending
- Graphical trend display
- Bluetooth Low Energy connectivity


## Frequently asked questions about testo 420

### What is testo 420 used for?

testo 420 is a mobile app designed to work with the testo 420 flow hood. It facilitates volume flow measurements, documentation, and reporting directly from your smartphone or tablet, making the process more efficient.

### Can testo 420 be used without the testo 420 hardware?

No, the testo 420 app can only be used in conjunction with the testo 420 hardware. It is designed to enhance the functionality of the physical device.

### What types of reports can testo 420 create?

testo 420 allows you to create reports in .pdf and .csv (Excel) formats. These reports can include measured values, comments, and photos for comprehensive documentation.

### How does testo 420 help with system analysis?

The app features a graphical trend display that helps identify changes within a system over time. This visual representation aids in understanding system performance and potential issues.

### What is the communication range of testo 420?

testo 420 utilizes Bluetooth Low Energy for communication, offering a range of approximately 65 feet. This allows for flexible operation without being tethered to the device.

### What devices is testo 420 compatible with?

testo 420 is available for smartphones and tablets, including iPhone, iPad, and iPod. It also has compatibility with Apple Watch.

### How often is testo 420 updated?

The latest version of testo 420 is 3.9.0, which was released on September 19, 2017. Future updates would depend on the developer's release schedule.

### What is the user rating for testo 420?

testo 420 has a user rating of 4.0 stars based on 3 ratings. This indicates generally positive user experiences with the app.

## Version history (last 1 release)

### 3.9.0 — 2017-09-19

This app has been updated by Apple to display the Apple Watch app icon.

Optimization of the app view for iOS 11

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## More apps by Testo SE & Co. KGaA

- [testo Combustion App](https://appshunter.io/ios/app/testo-combustion-app/id992414788)
- [testo 330i App](https://appshunter.io/ios/app/testo-330i-app/id1007290554)
- [testo Smart Probes](https://appshunter.io/ios/app/testo-smart-probes/id1026721981)
- [testo Thermography](https://appshunter.io/ios/app/testo-thermography/id1123010537)
- [testo Saveris Food Solution](https://appshunter.io/ios/app/testo-saveris-food-solution/id1436026886)

All apps by Testo SE & Co. KGaA: https://appshunter.io/developer/966489178

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*