---
title: "EIT Fernox App Guide"
description: "After downloading the app and completing registration, you can create a new Express Inhibitor Test by following the steps below."
url: https://help.fernox.app/en/articles/71-eit-fernox-app-guide
collection: "Express Inhibitor Test"
updated: 2026-10-02
language: en
alternates: [es, de, cs, fr-be, nl, nl-be, pl, fr, ro, tr, sk, sv]
---

# EIT Fernox App Guide

After downloading the app and completing registration, you can create a new Express Inhibitor Test by following the steps below.

### Adding a New Express Inhibitor Test

After downloading the app and completing registration, you can create a new **Express Inhibitor Test** by following the steps below.

* * *

### Step 1: Start a New Test

1.  Open the app.
    
2.  From the dashboard, tap the **Scan Icon**.
    
3.  In the pop-up menu, select **Onsite Test**.
    
4.  Choose **Express Inhibitor Test**.
    

![](https://staticfiles.gleap.io/ghelparticle/lBNbab5sVAsbTHfXzKGzBskrYEZ3NxosOPZsgecuGxl7DdLzy9iwpuSEPOAWuMJxmVJyo6Gd0wf.png)

* * *

### Step 2: Enter Customer & Location Details

Fill in the required fields:

-   **Customer Reference**: Add your own reference for reporting purposes.
    
-   **Project Reference**: Optional reference for your records.
    
-   **Company Name**: Enter the company name.
    
-   **Address**\*:
    
    -   Tap **Address Finder**
        
    -   Enter the postcode
        
    -   Select the correct address from the dropdown
        
    -   (Or choose from **Saved Addresses**)
        

![](https://staticfiles.gleap.io/ghelparticle/SxaE21sV7G5JdegWQ9AQOvNPTcCa0Ib6xW4Em7IwcU6ZdMN0nCeqcXdABopMbHkyFJ8kcRtNkJV.png)

* * *

## **Step 3: Enter System Information**

Provide details about the system being tested:

-   **System Type**: Select the system type.
    
-   **System Age**: Choose:
    
    -   0–2 years
        
    -   2–10 years
        
    -   Over 10 years
        
-   **Heat Appliance Manufacturer**:
    
    -   Select from the dropdown
        
    -   Search or manually add if unavailable
        
-   **Heat Appliance Serial Number**:
    
    -   Scan QR/barcode using your camera
        
    -   Or enter manually
        
    -   _Tip: Useful for reporting and manufacturer-related work_
        

![](https://staticfiles.gleap.io/ghelparticle/5qb4IOmSGSP777k0DOVEY3oXnCTvmYVLS1KIJKmxFsrrAnGBbwmvDSXOywiFzI3rl3RNsbVaqO1.png)

* * *

## **Step 4: Add Additional Details**

-   **Heat Appliance Age**: Select the appropriate range
    
-   **Inhibitor Protector Used**: Select or manually enter
    
-   **Reason for Sampling**: Choose the reason
    

* * *

## **Step 5: Perform the Inhibitor Test**

1.  Take a sample of system water.
    
2.  Dip the test strip into the water for **1 second**.
    
3.  Remove and shake off excess water.
    

-   **Inhibitor Test Image**\*:
    
    -   Take a photo within **10 seconds**
        
    -   Align the strip with the bottle colour chart
        
    -   Crop and confirm
        
-   **Inhibitor Result**\*:
    
    -   Select the value that matches the colour
        

![](https://staticfiles.gleap.io/ghelparticle/tQcMoybGgVlU9eQJHknO1O3xrjbFX8I28h2SwWU4ptBwepWvkbj4ZHyZIeq0tge4yAHJ6YVLg6c.png)

* * *

## **Step 6: Submit the Test**

Once all required fields are complete:

1.  Review your entries
    
2.  Tap **Submit**
    

Your **Express Inhibitor Test** is now complete.

[

EIT Contents & Preparation

It is an easy to use dip strip that tests central heating systems for the correct concentration of inhibitor, to ensure that the system is fully protected and sludge and debris is prevented from forming and building up.

](https://help.fernox.app/en/articles/128-eit-contents-and-preparation.md)