- Open the sheet you would like to scale.
- Select the ruler icon in the tool bar.
- Then select the calipers to select the calibration tool.
- Then draw a line along the scale you want to use and follow the prompts to set the length.
Tip: If your sheet does not have a scale as part of the legend you can use any known distance on the sheet. the longer the calibration the less error there will be for all measurements.