# Stack Testers Flow Friend — Stack testing mobile toolkit.

> Mobile toolkit for stack testing calculations for environmental engineers. (iPhone/iPad app by Lewis Holmes.)

- Source: https://appshunter.io/ios/app/stack-testers-flow-friend/id1454834655 (this page in markdown: same URL + `.md`)
- Developer: [Lewis Holmes](https://appshunter.io/developer/1454834389)
- Category: Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 32 MB
- Languages: English
- Released: 2019-03-05
- Data updated: 2026-07-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/stack-testers-flow-friend/id1454834655/reviews.md

## What is Stack Testers Flow Friend?

Stack Testers Flow Friend is part of a suite of apps developed by the Engineers of CES Environmental Instruments, one of the UKs leading environmental Test Houses and incorporates some of their on-site calculations in an easy to use app.

When working on the stack and you need to quickly calculate a velocity or volume flow, the answer can be at your fingertips.  By inputting the essential parameters of the stack size and gas conditions, the velocity and volume flow can be determined without the need to manually calculate the value or start up a laptop.  The app is an essential tool for the professional Environmental engineer. 

The app is a useful aid to the C & I engineer calculating the Differential Pressure cell mA output used for data logging.

The contents of the CES Environmental Instruments popular Engineers Note Book is preloaded within the app.

## Key features

- Velocity and volume flow calculations
- Input stack size and gas conditions
- Differential pressure cell mA output calculation
- Preloaded Engineers Note Book content
- On-site calculation tool

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/stack-testers-flow-friend/id1454834655/reviews.md

### 1/5 — Useful

*2020-07-07*

Use this quite a lot and does make life easier

## Frequently asked questions about Stack Testers Flow Friend

### What is Stack Testers Flow Friend used for?

Stack Testers Flow Friend is a mobile toolkit designed for environmental engineers to perform on-site calculations related to stack testing. It helps determine velocity and volume flow, as well as calculate differential pressure cell mA output for data logging.

### Is Stack Testers Flow Friend free to use?

Yes, Stack Testers Flow Friend is available for free. It does not require any payment to download or use its core functionalities.

### What devices does Stack Testers Flow Friend support?

Stack Testers Flow Friend is compatible with iPhones, iPads, and iPods. It is designed for iOS devices.

### How often is Stack Testers Flow Friend updated?

The app was last updated on July 14, 2025, indicating ongoing support and potential for future improvements. The latest version is 1.2.11.

### Does Stack Testers Flow Friend require an internet connection?

The description implies on-site calculations without needing a laptop, suggesting it can function offline for its primary calculation features. This is beneficial for field use.

### Can Stack Testers Flow Friend be used for general gas flow measurements?

While it's designed for stack testing, the ability to input stack size and gas conditions suggests it can be adapted for general gas flow calculations in specific industrial contexts.

### What kind of engineers would benefit most from Stack Testers Flow Friend?

Professional environmental engineers and C&I (Control & Instrumentation) engineers who work on stack testing and require quick, on-the-spot calculations will find this app most beneficial.

### Does Stack Testers Flow Friend have ads?

No, Stack Testers Flow Friend does not contain advertisements. It is a free application without any ad interruptions.

## Version history (last 5 releases)

### 1.2.12 — 2026-06-19

- Updated DURAG guidance PDF.

### 1.2.11 — 2025-07-14

Fixed a decimal place inaccuracy in mm.H2O conversion for flow calculation.

### 1.2.10 — 2025-06-20

Updated to work with newest versions of iOS.

### 1.2.01 — 2024-02-19

- Stability and bug fixes.

### 1.1.21 — 2023-06-17

- Minor bug fixes

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## More apps by Lewis Holmes

- [Stack Testers Friend](https://appshunter.io/ios/app/stack-testers-friend/id1454834390)
- [Stack Testers Revision Friend](https://appshunter.io/ios/app/stack-testers-revision-friend/id1531634040)

All apps by Lewis Holmes: https://appshunter.io/developer/1454834389

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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 2026-07-05.*