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How do I use the "calibration" function? Is there anything I need to prepare first?

· FAQ - Ruler Pro

How do I use the "calibration" function? Is there anything I need to prepare first?

If you think the measured value is not accurate enough, you can perform the calibration first.

Before calibration, please prepare a sheet of paper.

A4 or US Letter and other standard specifications are preferred, if not, rectangular paper of any size is also acceptable.

For details, please refer to here.

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