How can I know if I scaled my blueprint properly in MeasureSquare Stone?

It is about how you know that your plan has been scaled properly, especially after it is already imported into your takeoff screen.

Step 1: Click on your imported Plan, open the Property panel on the right-hand side, and check the "Blueprint Scale" which shows the current floorplan's Scale.

Step 2: For extra measure, click on the Dimension Tool at the top of the Ribbon. Next click the Start and End points of a familiar length on your drawing. For example, if you know the door should be 3', then measure out one of the doors.