How do I edit geometry to a specific size?

For example, I'm doing a trade show booth layout and I need to use specific dimensions. I can create original geometry (like a cube) and use the polyCube1 history node to size to dimensions. But if I duplicate that cube or remove its history, I can see no way to size it to specific dimensions. (other than creating a temporary object of the correct size and resizing the cube next to it.)

How does one resize an existing piece of geometry (whether freshly created, duplicated or otherwise developed) to a specific size, preferably via numeric input?

Thanks.