Thanks for the advice. I wasn't sure I how to build it or where to get the parts. I had not checked any prices yet.
I am experimenting with thermocouple sensors but I also want to experiment with a hakko 907. I have seen a few controllers that work with the hakko 907 ptc sensor. Are there any that work with thermocouple sensor like the solomon sl-30 iron? I would really like one that works with both but I don't know if that exists.
If you could point me in the right direction that would be much appreciated.