> 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/logger-card-client-user-manual/calibration.md).
# Calibration
The Calibration function is used to set the Logger card calibration adjustment.
The user must be logged into the system for this function to work.
There are 3 types of cards offered by ICU Scandinavia AB:
1. FU002 - Transport logger card Standard
2. FU003 - Transport logger card High resolution
3. FU004 - Transport logger card High temperature
The cards are calibrated during the production, but a user can change the adjustment if needed.
To calibrate a card:
1. Connect the card to the reader and click the 
icon.
2. The calibration adjustment window will open.
### FU002 - Transport logger card Standard
The upper form part provides information about the current calibrator, the date of calibration and a comment.
To set an adjustment:
* enter adjustment value in “New adjustment \[°C]” field,
* optionally add a comment,
* click “Set” button to save the calibration settings in the sensor.
The message box will inform about the save procedure result:
### FU003 Transport logger card High resolution andFU004 Transport logger card High temperature
The upper form part provides information about the current calibrator, the date of calibration and a comment.
FU003 and FU004 sensors (DS1922L/T) allows to set one or two calibration points depending on the calibration performed.
To set a single point calibration:
* select “Single temperature point adjustment”,
* enter reference temperature value in “Hot-reference temperature \[°C]” field,
* enter calibration adjustment value in “Hot-reference adjustment \[°C]”
* optionally add a comment,
* click “Set” button to save the calibration settings in the sensor.
To set two points calibration:
* select “Two temperature points adjustment”,
* enter reference temperature values in “Cold/Hot-reference temperature \[°C]” fields (check that value in “Cold-reference temperature” field is lower than in “Hot-reference temperature” field),
* enter corresponding adjustments in the “Cold/Hot-reference adjustment \[°C]”
* optionally add a comment.
* click “Set” button to save the calibration settings in the sensor.
FU003 and FU004 sensors offer a functionality to restore the default calibration values set during production.
To restore default calibration settings,
* press “Return to factory data”\_\_button. The fields with temperature settings will be filled automatically),
* optionally add a comment,
* click “Set” button to save the calibration settings in the sensor.
The message box will inform about the save procedure result:
## Troubleshooting
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