User-Defined Unit:  Here is where you select your user-created measurement unit.  This box will list only those measurement units that have been created by the user.

Measurement Class:  Once you have selected your measurement unit, the measurement class of that unit will appear in this box.  This value cannot be edited.

Primary Conversion Unit for Selected Unit:  All measurement units have a Primary measurement unit to convert to, and this box displays the primary unit associated with your selected unit.  You can change the primary unit by clicking on the box and selecting a different one.  If your selected unit IS the primary unit, then the label for this box will turn green to alert you to that fact.  In this case, you probably will want to leave all the “Secondary Conversion” data alone since this secondary conversion only converts the unit to itself.  However, having a primary unit as your selected unit allows you to change the “Primary Conversions” data.  You can only modify the “Primary Conversions” data if you have selected a Primary unit in the “User-Defined Units:” box.

Selected Unit Input Name – Singular:  This is the singular form of the name of your selected measurement unit (i.e. Foot instead of Feet).  Unit Converter uses the singular form of the name in the one-to-one conversions.

Selected Unit Input Multiplicative Conversion Factor:  This is the multiplicative conversion factor for converting your unit to the Primary measurement unit.

Selected Unit Input Additive Conversion Factor:  This is the additive conversion factor for converting your unit to the Primary measurement unit.

Selected Unit Output Multiplicative Conversion Factor:  This is the multiplicative conversion factor for converting the Primary measurement unit to your unit.

Selected Unit Output Additive Conversion Factor:  This is the additive conversion factor for converting the Primary measurement unit to your unit.

Selected Unit Definition:  This is the definition entered for the selected measurement unit.

Primary Conversion Data:  These are the conversion factors for converting between the primary units of the measurement class.  You can only edit these data if you have selected one of the primary conversion units as your selected unit, and if you created these conversion factors originally using the Primary Unit Worksheet.  None of the original conversion factors that come with Unit Converter can be edited.  To edit these data, just type new values in the table.  The field sizes can be changed by positioning the cursor between the field headers and dragging on them.

Primary Conversion Worksheet:  Clicking on this button will take you to the Primary Conversion worksheet, where you can create new measurement classes.

Secondary Conversion Worksheet Button:  Clicking on this button will take you to the Secondary Conversion worksheet, where you can add units to existing measurement classes.

Delete All User-Entered Units:  Clicking on this button will delete all user-created measurements from the database.

Delete Selected User-Entered Unit:  Clicking on this button will delete the currently selected measurement unit.  The name of the currently selected measurement unit appears on this button.

HELP Button:  This button opens a help screen with this information so you can get help without having to open the manual.

SAVE CHANGES Button:  This button saves any changes made to the database.

CANCEL Button:  This button clears out any changes that have been made to the data and returns them to their original values.

EXIT Button:  This button closes the Review/Edit User Conversions Window.  If you have made any changes to the data in this form, Unit Converter will ask you if you want to save the changes before you exit this window.