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Navigation: PDF-XChange Editor Plus V9 User Manual > Tabs Guide > Comment Tab > Measuring Tools >
When the Measuring Tools are selected, click Scale in the Format tab to view/select/manage/calibrate scales:
Figure 1. Format Tab, Scale Options
•Click Manage Measurements to view/edit/clone/delete scales.
•Click Calibrate Measurement to calibrate a new measurement. The pointer will become a crosshairs icon. Click and drag to determine a distance for calibration. The Calibration dialog box will open:
Figure 2. Calibration Dialog Box
•The distance determined in the document is detailed in the upper number box. Use the dropdown menu to select the desired units of measurement.
•Use the lower number box to determine the scale. Enter a numerical value and the desired units of measurement for the scale.
•Name and describe the calibration. The scale will be detailed in Scale pane.
Click OK to save the calibration.
The keyboard shortcut to enable this feature is Ctrl+Shift+C.