PDF, image, or DXF. For PDF and image drawings, set the scale first by clicking two points on a known dimension. DXF files carry their own units and are scaled automatically, with a per-layer quantity summary.
L length A area R rect O circle G arc F fill Y schedule V volume C count (saves per click) D deduct K scale Enter finish Ctrl+C copy Ctrl+V stamp Alt+click remove point Esc cancel Space pan Shift ortho X snap type a length then Enter