I need to get a few more parts from my local Graingers, but I am hoping to have the controller done by the weekend. For some reason I was thinking that the PID would be about 4 inches square, so I was surprised to see that it is barely half of that. Here it is mounted in the Auberins project box, and a closeup with a quarter for size reference. Small or not, I can't wait to put that bad boy to work!