> 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/mount-the-reference-sensor.md).

# Mount the reference sensor

Mount the reference sensor as close as possible to the sensor that you want to calibrate to minimise the temperature difference between them. 

You may use the DBU001 aluminum block for it.

<figure><img src="/files/7Qq8oFJKhEorO1c3hfo5" alt="" width="130"><figcaption></figcaption></figure>

The WLREF sensor is 4 mm metal tube that fits the smaller hole in the block. The calibrated sesnor may be placed in the bigger hole visible in the picture above.


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