. I wanted interchangable thermocouples, and the yellow plug socket in the front is made specifically for thermocouples. I planned on using this PID for multiple projects, so all cords are detachable and/or upgradeable. I may overthink things too much. The wiring is (sort of) color coded by circuit, I figured I was going to screw this up and I wanted to be able to trace the circuits in a tight space without yanking on the wiring to see where everything goes. A friend on mine built a similar PID, but all his wiring insulation is black. I underestimated myself with this project though, the PID worked perfectly from the moment I turned it on. And it has worked without a hitch for over two years now. These are all common, off the shelf components I ordered from Amazon with the exception of the TC plug and socket, and the TCs themselves. The chinese TCs were awful, and I went through five of them in a year. The plug-ins came from Auber Instruments, as did the replacement TCs.
