I have not been casting for very long, but I hooked up a PID to my lee 4-20 pot and all I can say is I would that I had done this a couple hundred pounds ago. Wow, you find what temp your alloy likes (725 for mine) and it will be there very time no guess work no messing with the controls to regulate it. It is one less variable to have to deal with, if you’re new to it like me. I know some of you old hands and it can sniff the melt and know, but for the apprentice of us it is a great asset and you can also use it to make sure the oven is holding the right temp for powder coating.