> 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/assign-reference-sensor-to-calibration-row.md).
# Assign reference sensor to calibration row
To run a calibration, you must assign a reference sensor to a calibration row first.
You can assign up to 5 reference sensors and use them simultaneously.
Instructions for all the types of reference sensors are presented below.
Tap “Reference sensor” button.
A Bluetooth search window will be opened, presenting the Bluetooth devices discovered around. Every row contains device name, its Bluetooth address and standard. Only Bluetooth Low Energy (BLE) devices are shown and can be selected.
For Dostmann P790 enable its Bluetooth interface as described in [Dostmann P790](/boomerang-3-calibration-app-manual/calibration-set/reference-thermometers/dostmann-p790.md) chapter.
For WLREF sensor, press its wake-up button shortly. Observe if red LED is on.
The reference meter shall now be discoverable over Bluetooth.
Tap the reference sensor Bluetooth name to open a reference sensor form. The name is a serial number for Dostmann P790 and icusens.wlref in case of WLREF sensor.
Enter the values that are missing like “Name”, “Sensor type”, “Sensor serial number”, “Sensor uncertainty value” and “Certificate number”. For WLREF all the values besides Name will be filled-in automatically basing on the [WLREF adjustment file](/boomerang-3-calibration-app-manual/calibration-app/wlref-adjustment-file.md).
For P790 select the channel, as it can be equipped with two sensors.
The “Check values” button is used to read the current measurements from the reference sensor(s). It can be used to check if the selected sensor is a correct one.
The “Clear sensor” button is used to delete all the data in case you want to assign another reference sensor to a given row. The same happens if you decide to leave the form without entering all the data as described below.
The fields’ descriptions are presented in the table below.
| Field | Description |
| ------------------------ | ------------------------------------------------------------------------------------------------ |
| Selected device | Bluetooth name of the reference instrument or sensor. |
| Name | Name of the reference instrument or sensor entered by the user |
| Sensor type | Reference sensor type. Filled-in automatically. |
| Sensor serial number | Reference sensor serial number from its certificate. Filled-in automatically for WLREF. |
| Sensor uncertainty value | Reference sensor uncertainty value stated on its certificate. Filled-in automatically for WLREF. |
| Certificate no. | Number of the reference sensor calibration certificate. Filled-in automatically for WLREF. |
| Long term drift | A long-term drift of the sensor. Filled-in automatically. |
| Bluetooth device sensor | A channel number in case the reference meter has multiple sensors. |
Tap “Close & save” to save the data and return to the main window.
The form can be saved only if all the fields are defined. If you tap “Close & save” with some fields empty, a warning will be displayed.
If you tap “OK”, then any data you entered will be deleted and you will return to the main window with no reference sensor selected for the row.
After the form is saved, the row is in a Ready state and can be used for calibration.
For P790 remember to disable its Bluetooth interface to preserve the battery, as described in [Dostmann P790](/boomerang-3-calibration-app-manual/calibration-set/reference-thermometers/dostmann-p790.md) chapter.
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