> 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/wlref-adjustment-file.md).
# WLREF adjustment file
From version 107 the WLREF parameters like certificate number, adjustment values and their uncertainties are handled automatically. All the parameters stated above must be entered into a text file with err extension.
The procedure shall look as follows:
1. WLREF sensors are calibrated yearly in the accredited lab that provides their certificates.
2. The information from the certificates is entered into the text files in the following format:
1. First line contains the WLREF serial number.
2. Second line contains the certificate number.
3. The following lines contain reference temperature, measurement error and its uncertainty for all the calibration temperatures. The values can be separated by tabs or by spaces.
4. The file name is *WLREF serial number.err*.
An example of the WLREF S/N e1203f21e1b5 certificate and the its e1203f21e1b5.err file contents is shown below:
```
e1203f21e1b5
246/2/25
-80,005 0,023 0,030
-55,003 0,011 0,030
-40,000 0,014 0,030
-20,003 0,020 0,030
-0,002 0,018 0,030
4,999 -0,006 0,030
9,999 -0,004 0,030
20,000 0,006 0,030
30,005 0,017 0,030
37,004 0,012 0,030
49,998 -0,003 0,030
105,005 0,013 0,030
```
The easiest method to create the err file adjustments part is to copy the contents of the table from certificate and then remove the Measured values column, entering tabs between values in a row.
3. The err files must be created for all the WLREF sensors that will be used.
4. The err files must be reviewed for correctness, officially released and stored together with the certificates.
5. The err files shall then be copied to the tablet into the Documents\Cal App\Adjustments directory.
6. If a user will [Assign reference sensor to calibration row](/boomerang-3-calibration-app-manual/calibration-app/calibration-row/assign-reference-sensor-to-calibration-row.md) and for which there will be no err file, the Cal App will disable the calibration row.
In such a case, copy the correct err file into Documents\Cal App\Adjustments and click Info twice to refresh the main page. If the WLREF serial number will match the err file name, the row will be enabled.
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://help.boomerang3.com/boomerang-3-calibration-app-manual/calibration-app/wlref-adjustment-file.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.