[Joe]

I am not sure about what thermocouple you are using, but I dont have ANY and have never seen one small enough to sit next to a core and still have room for goop and stuff to hold it there. Normally they are connected via fairly stiff solid conductor wires which makes it hard to keep from moving around.

its a nice idea but unfortunately I somewhat doubt you can get a T/C thats small enough and able to be secured well enough.