# Stack Testers Friend — Stack testing mobile toolkit.

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

- Source: https://appshunter.io/ios/app/stack-testers-friend/id1454834390 (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 · 33 MB
- Languages: English
- Released: 2019-03-05
- Data updated: 2026-07-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/stack-testers-friend/id1454834390/reviews.md

## What is Stack Testers Friend?

The app has been 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 one easy to use app.

When working on the stack and you need that quick answer to a gas conversion or probe position, the answer can be at your fingertips.  Simple and easy to use the app contains lots of essential calculations for the stack tester without the need to manually calculate the value or start up a laptop.  The app is an essential tool for the professional Environmental engineer having all the tools to quickly check the numbers whilst out and around site. 

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

The app can do the following and much more:

- Calculate Dia, CSA, Circ.
- Isokinetic sample positions, General  & Tangential
- Extraction rates
- Gas density
- Calculate H20 from wet & dry Oxygen
- Gas ppm/mg/m³ conversions & Normalisation
- LOD
- Particulate Matter Normalisation & estimation of temp, H2O & O2
- Ranging & scaling of dust monitors & outputs
- Calculation of values using calibration functions
- Biomass fuels

## Key features

- Gas conversion calculations
- Isokinetic sample position calculations
- Extraction rate calculations
- Gas density calculations
- Particulate matter normalization
- Calibration function calculations

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/stack-testers-friend/id1454834390/reviews.md

### 5/5 — very handy

*2022-07-01*

saves me loads of time on site when doing calculations

## Frequently asked questions about Stack Testers Friend

### What calculations can Stack Testers Friend perform?

Stack Testers Friend can perform calculations for diameter, CSA, and circumference, isokinetic sample positions, extraction rates, gas density, H2O from wet & dry Oxygen, gas ppm/mg/m³ conversions, LOD, particulate matter normalization, ranging and scaling of dust monitors, and calculations using calibration functions. It also includes biomass fuel calculations.

### Is Stack Testers Friend available on Android devices?

Based on the provided data, Stack Testers Friend is supported on iPhone and iPad. Information regarding Android compatibility is not available.

### How often is Stack Testers Friend updated?

The latest version of Stack Testers Friend is 1.3.10, last updated on June 20, 2025. This indicates a recent update, suggesting the app is actively maintained.

### What is the age rating for Stack Testers Friend?

Stack Testers Friend has an age rating of 4+, making it suitable for a wide range of users. This rating suggests no mature content is present.

### Does Stack Testers Friend have ads?

No, Stack Testers Friend does not contain advertisements. The app is free to download and use without any ad interruptions.

### Can I use Stack Testers Friend offline?

The description implies that the app provides quick answers at your fingertips while working on-site, suggesting it is designed for use without constant internet connectivity. However, specific offline functionality is not explicitly detailed.

### What makes Stack Testers Friend useful for environmental engineers?

It incorporates on-site calculations from a leading UK environmental test house, putting essential tools like gas conversions and probe position calculations directly on a mobile device. This eliminates the need for manual calculations or starting up a laptop in the field.

### Does Stack Testers Friend offer any in-app purchases?

No, Stack Testers Friend does not feature any in-app purchases. The app is entirely free to download and use, with all its functionalities available without additional cost.

## Version history (last 5 releases)

### 1.3.11 — 2026-06-19

- Updated DURAG guidance PDF.

### 1.3.10 — 2025-06-20

Updated to work with newest versions of iOS.

### 1.3.01 — 2024-02-19

- Stability and performance improvements
- Bug fixes

### 1.2.71 — 2023-06-17

- Minor bug fixes

### 1.2.1 — 2023-03-28

Added new calculations, consolidated gas calculations and added new PDF viewer.

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## More apps by Lewis Holmes

- [Stack Testers Flow Friend](https://appshunter.io/ios/app/stack-testers-flow-friend/id1454834655)
- [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 2026-07-07.*