@billkaroly Bill: I re-read my post and I think it comes across as a shot. It was not my intention. I just thought that, with the Mill, we could achieve the same thing. No offence taken, I hope.
In terms of using that tool for setting up the Mill, here is a link to a video that uses the 3, 4, 5 method to see if your CNC router it properly set up.
I used this method on my Mill and was pleasantly surprised to find my spot on. The beauty of this method is that it is free and easy to do.