Reads how large a gizmo's handles are drawn relative to the default size.
The gizmo
The scale ratio
Sets how large a gizmo's handles are drawn; 1 is the default size and 2 doubles it, whatever the attached mesh's size.
The gizmo and the scale ratio
The same gizmo
Settings shared by every gizmo: the scale ratio that sets how large the handles are drawn on screen, independent of the size of the mesh they are attached to.