# 8.5.3 Barometer Calibration:

These sensors are crucial for measuring the drone's altitude. To ensure precise pressure measurements, it's essential to calibrate the barometer before each flight using the Barometer calibration feature. 

1\.   Click the "**Calibrate**" button in front of the Barometer. The following screen will be displayed on the user’s screen. 

<figure><img src="https://3726973265-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEJHDgY5EjEXnZCA7cAxk%2Fuploads%2FZyAs9fswnmsEDzahQTat%2Fimage.png?alt=media&#x26;token=89077e79-e5cc-41c1-8db8-20e7a7a80d4c" alt=""><figcaption><p>Barometer calibration</p></figcaption></figure>

2\. Once the user has finished all barometer calibrations, simply click “**Done**”.