You can set a custom scale size value from the Copy tab and from the Scan tab.
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Press the Copy tab or Scale button if you are performing a copy job or. Press Scan tab, Resize if you are performing a scan to file job.
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Press the Scale button and then the Tool button
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In the Scale Setup dialog, press the New button.
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Enter a name for your new scale. Using the scale value itself as the name is recommended (i.e., "72%")..
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Press the Value button and set the scale value.
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Press the Save button and then OK to confirm..
Your new scale will join the standard scales in the scale presets list.