> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/boomerang-3-calibration-app-manual/performing-the-calibration/start-calibration/define-b3-sensor-for-calibration.md).

# Define B3 sensor for calibration

For B3 automatic calibration a dialog is opened to select the Boomerang 3 sensor that will be calibrated. 

<figure><img src="/files/WLMN6FdKkeNK38sp87d7" alt="" width="375"><figcaption></figcaption></figure>

You may search for a specific name using the field on top of the dialog.

<figure><img src="/files/kJqXTI0CsWtvIgp4YJh5" alt="" width="375"><figcaption></figcaption></figure>

Tap the sensor you want to calibrate. A form is opened to enter the serial number and resolution of the sensor to calibrate. The form contains also the environment conditions.&#x20;

The serial number is stated on the sensor label. Some of the fields may be filled in automatically, basing on B3 settings available for a given MP.

In "Calibrated sensor resolution" select the correct sensor type or select "Custom" and enter the resolution manually. The detailed information about sensor resolutions can be found in [Calibrated sensor resolution](/boomerang-3-calibration-app-manual/advanced/calibrated-sensor-resolution.md) chapter.

Enter the delay (min. 0 min) and the total time which is delay plus 11 min. (min. 11 min).

<figure><img src="/files/AMf9L1UQEhlxMNv8fbUz" alt="" width="255"><figcaption></figcaption></figure>

Tap “OK” to start the calibration.\
The app will communicate with Boomerang 3 server to initiate the calibration process.

In case of WLREF sensor, press its button to wake it up as the Cal App must send a command to initiate the measurements. After initiation, WLREF will start measuring every minute and will store the readings in its internal memory.

<figure><img src="/files/hTVZzCoUMN5P0GRyQvvz" alt="" width="207"><figcaption></figcaption></figure>

Next follow the steps described in [Calibration run](/boomerang-3-calibration-app-manual/performing-the-calibration/calibration-run.md).


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