> 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/calibration-app/calibration-row.md).

# Calibration row

There are 5 Bluetooth calibration rows in the main window. At the first app start they al look as shown below.

<figure><img src="/files/05A0rCmUFEBIozcOFjld" alt="" width="563"><figcaption></figcaption></figure>

They are used to control the calibration processes for up to 5 Bluetooth sensors.

After a reference sensor is assigned to a row, it's name is shown in the left upper corner of the row. The row is ready to start the calibration.

<figure><img src="/files/w1WqTG79VwCi87R4wj2p" alt="" width="563"><figcaption></figcaption></figure>

During the calibration the calibrated sesnor name is shown in the right upper corner. There are also buttons that allows to cancel or repeat the calibration of the same sensor.

There are also 5 more calibration rows prepared for the future use with a different type of reference sensors. They cannot be used now.


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