> For the complete documentation index, see [llms.txt](https://help.waterwatch.io/3.0.1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.waterwatch.io/3.0.1/installation-guides-tank-monitors/tank-monitor-4g-setup-before-oct-2022.md).

# Tank Monitor - 4G Setup (before Oct 2022)

{% hint style="info" %}
Before installing please read our [positioning tips](/3.0.1/tank-monitor-positioning.md)
{% endhint %}

{% file src="/files/efl4ctop53gZdoA4xAlD" %}

#### Tools you'll need:

To give your sensor a clear view of the water in your tank, [you'll need to drill a 50 - 60mm hole in your tank](/3.0.1/hole-saw-options.md). This is a standard size drill bit available from your local hardware store. 

<figure><img src="https://3663084420-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FUHGkYdZf2x89OKqHUwwA%2Fuploads%2FjyfTauYG08n1QWBzVfI3%2FTank-Setup-1A.png?alt=media&amp;token=551f940d-c2c5-4cf8-8d9e-261fc0a7e384" alt=""><figcaption></figcaption></figure>

#### Open the mobile app and begin the set up wizard, you'll need to be at your tank to follow these steps.

<figure><img src="https://3663084420-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FUHGkYdZf2x89OKqHUwwA%2Fuploads%2Fm9Do72yQBbpxBD7efnTr%2FTank-Setup-2A.png?alt=media&amp;token=20f9a2d2-88a6-4a05-9533-28b0d0302572" alt=""><figcaption></figcaption></figure>

The setup wizard will help you to:

* Connect to the tank monitor with Bluetooth
* Drill a 50 - 60mm hole in your tank
* Take measurements
* Attach your tank monitor to the tank
* Verify your first measurements