Here are the secrets to the Measure Tool support:

(1) in the “Utilities” menu select “Add Command…”
(2) in the “Add Command” dialog select “Measure…” from the left popup
(3) click the >> button to move the command to the right popup and save the command
(4) go to the Utilities menu again and select the new item “Measure…”
(5) click “New” in the Measure dialog and select two points in your geometry