This registry entry sets the font size of the Operators Comments in the Report command when you select the Automatically resize font option on the Probe Readouts Setup dialog box (Edit | Preferences | Probe Readouts Setup).
Entry Name: ReadoutDisplayFont_AutoHistoryFontSizeRatio
Entry Type: The default value = 0.5 which equates to half the font size of the XYZ values. The valid range is 0 to 1 inclusive where 1 sets the font size to be the same size as the XYZ values.
For information on the Probe Readouts window, see "Using the Probe Readouts Window" in the "Using other Windows, Editors, and Tools" chapter of the PC-DMIS Core documentation.