> For the complete documentation index, see [llms.txt](https://help.tillit.cloud/tillit/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.tillit.cloud/tillit/knowledge-base/setting-up-tillit/material-definition/material-tolerance/example-of-material-tolerance.md).
# Example of Material tolerance
### Example
For this example, I want to add a Tolerance called Wine Fermentation Temperature to a wine product to define operational temperature limits during fermentation on every order that produces this material.
{% stepper %}
{% step %}
Start by going to ***Settings > Material Definition > Materials***.
{% endstep %}
{% step %}
Select the material you want to edit. In this example, we're going to open ***Malbec 2024 – 750ml.***
{% endstep %}
{% step %}
Scroll to the ***Tolerances*** panel and click to open.
{% endstep %}
{% step %}
Click on the **Create** button.
{% endstep %}
{% step %}
You will be presented with a pop-up modal asking you to select an existing [Process Variable](/tillit/knowledge-base/setting-up-tillit/configuration/process-variable.md) from the drop-down menu or create a new one.
{% endstep %}
{% step %}
Fill in the operational limits as relevant.
{% endstep %}
{% step %}
Click ***Save and close*** to finalise.
{% endstep %}
{% endstepper %}
This tolerance will now be defined on all orders that use the ***Malbec 2024 – 750ml*** material.
