This is a very basic Object Tool library part, which allows you to stretch 2d hotspots to the diagonal length/width of the room to get an easy room dimension tag for your floor plans.
This object is 2d only and is not tied to zone settings or automated to actual room size. It will require manually placing and maintaining the correct position and size. It will, however, automatically adjust the size stamp when resized. It also allows for manual repositioning of the text location.