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With the Use Scale and Units From Document (When present) option selected:.

To calibrate the scale ratio for your document for an accurate result, you can choose either of the following methods: Then all the following measurements will use the embedded scale ratio you set. To do so, you need to select File > Preferences > Measuring and use the Use Scale and Units From Document (When present) option. If this happens, you may need to customize the scale in order for your PDF file to accurately reflect the measurements in use. This can be a big problem in any setting where precise measurements are critical. That can happen for reasons such user error, or when drawings aren’t directly exported from an Auto CAD program.

Some users who rely on measurement accuracy have told us that they sometimes receive a PDF drawing in which the scale is off from what the image states in the document. That’s useful when you’re creating manuals, instructional guides, and computer-aided design ( CAD) drawings. Using the Measure Tools, Foxit PDF Editor and Foxit PDF Reader make it easy to measure distances and areas of objects in PDF documents.