You will probably get best results from a thermocouple probe that has a washer or ring terminal on the sensing end. *
With the 6mm threaded probes, the extra mass, along with relatively poor conduction, will slow the response, making control more of a challenge than it needs to be.
Look for a grounded probe, terminated with a ring/washer sized for #6 screw, with leads around 1 meter in length. *Type T material has the least inherent errors in this temperature range, but type K is acceptable as well. *Teflon insulation is best.
We offer a suitable type K probe through evilbay.com, but cannot figure out a way to supply them to CSers without incurring significant shipping expenses *:-X