# Threshold Advanced Parameters

The **Inverse interval** checkbox is used to define non-contiguous ranges. In this example, the module will change to the critical state if the value is below 20 or above 80:

[![quickguide_inverse1.png](https://pandorafms.com/guides/public/uploads/images/gallery/2023-08/scaled-1680-/quickguide-inverse1.png)](https://pandorafms.com/guides/public/uploads/images/gallery/2023-08/quickguide-inverse1.png)

In string modules, the threshold is defined as a substring. Similarly, it can be inverted so that the module goes into `CRITICAL` if it does **not** contain the substring passed as parameter:

[![quickguide_inverse2.png](https://pandorafms.com/guides/public/uploads/images/gallery/2023-08/scaled-1680-/quickguide-inverse2.png)](https://pandorafms.com/guides/public/uploads/images/gallery/2023-08/quickguide-inverse2.png)