At $27 (with coupon) I couldn't resist this item, a Fluke-clone type K thermocouple probe:
I had to take the first one back as it was off about +6 deg F on an ice- bath calibration test, and also comparing to my mercury lab thermometer at room temps. As always, the local HF store was happy to exchange or refund the purchase. They brought out another unit, and I sat them side by side on the checkout counter, and saw the proffered exchange was reading about right, so I accepted it.
They don't tell you what the insulation is on the probe line, but it certainly could not take the 2000 deg K temperature specified. Typical Chinese absurd spec. Seems to be PTFE or other high-temperature polymer, but not that high.
Connector seems to be the mini standard type, so I hope replacement probes from
It does seem to respond well, and to maintain accuracy to the +/- 0.5 percent spec, so this should do well in HVAC and other applications for the thermocouple type probe.