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Ctrl-click to add to the selection

While measuring objects, do any of the following: To snap the measurement to the end of a line, select Snap To PathsTo snap the measurement to the endpoint of a line, select Snap To Endpoints

To snap the measurement to the midpoint of a line, select Snap To MidpointsTo snap the measurement to the intersection of multiple lines, select Snap To Intersections To constrain the measurement lines to increments of 45º, hold down the Shift keyTo discontinue a measurement, right-click and choose Cancel Measurement

To delete a measurement markup, click it with the Measurement Tool and press the Delete keyMeasuring tool options To set measuring tool options, select the tool, then right-click anywhere in the PDF to view the options

Change Scale Ratio Change the scaling ratio (such as 3:2) and unit of measurement on the drawing areas

Change Markup Label Add or change text that appears with the measurementUse this preference only when you encounter problems in poorly tagged PDFs

This preference corresponds to the Override The Reading Order In Tagged Documents option in the Accessibility Setup AssistantPage Vs Document This preference determines how much of a document is delivered to a screen reader at a time

If a PDF isn’t tagged, Acrobat may analyze the document and attempt to infer its structure and reading orderThis process can take a long time for a long document