I do not like SketchUp “Pro” at all. Make a drawing, dimension it, save it, export it as a DXF. Turn around and import that DXF file, and the scale has changed. Huh? Okay, fix the scale of the DXF file, save it. Open it again, and the scale is once again off. If you want to use SketchUp, stick with the free version – that’s all it’s worth. Every single reason for why I bought the Pro version has proven to be a mistake.