There are no options in Adobe PDF forms to display a scale. However, you can create a work-around by stacking transparent checkboxes on top of each other like this…
Check box 1 should have five checkboxes stacked on top of each other with values of 1, 2, 3, 4, and 5.
Check box 2 should have four checkboxes stacked on top of each other with values of 2, 3, 4, and 5.
Check box 3 should have three checkboxes stacked on top of each other with values of 3, 4, and 5.
Check box 4 should have two checkboxes stacked on top of each other with values of 4, and 5.
Check box 5 should have one checkbox stacked on top of each other with a value of 5.
Set all the checkboxes to display a STAR rather than a check or X or +.
Checkboxes with the same value must have the same name, there should be 5 names One, Two, Three, Four, Five
Map the Formidable scale field to all five of the checkbox names.
So if the value of the scale is 3, all PDF checkbox fields receive a value of 3 but only the checkboxes with 3 as a value will show a star, so number’s 1,2,3 will show stars.
We remain at your service.