I have just downloaded the trial of this "new" tool and cannot find any documentation of how it is meant to be used, in particular how to actually get the measure of an actual archicad item. Has anyone else had a play around with this yet?
We've finished writing the documentation for it and are just working on getting it published to the site now - it'll be done over the next couple of days. If you want to have a read through of it earlier than that though, let me know your email address in a PM, and I can send you a PDF copy of it while we get the online version ready.
To answer your question though - I'm not sure what specifically you're trying to measure, but say for example, you wanted to measure the length of a wall - first, you'd need to have a Bill Item to measure that, and set the rate to something like 1 unit = 1 Metre. Then, add that Bill Item to a recipe which targets walls (I'd use a condition like element.type = "Wall"), and set a Quantity Calculation for the wall length using an expression like 'wall.length' (or element.length if you want to include all elements, rather than just walls)
Then just run a Calculate in the Bill of Quantities palette, and you'll get the length of your wall (or of all walls in the project). The screenshot below shows the setup for doing that.
Obviously, thats a basic example, but should kinda give you an idea of how to get what you actually want out of it.