Review on Efficient Temperature Measurement with 5pcs 🌡️ 3M K Type Mini-Connector Thermocouple Sensor -50~700°C by Maurice Branch

Media could not be loaded. Tested at 450C for 5 hours, still works great. Shrink tubing blown. The fiberglass insulation is fine except for the blue pigment that has faded or turned white. The brown color on the insulation in one section is most likely carbon deposits from the furnace condensing on the furnace inlet and not the thermocouple (but judge for yourself). The timing seems plausible, but apparently no better than usual for K-types. Looks like the next thing to do at higher temperatures is fiberglass or beads. Tried with the heat gun at max and reached "530C" with no further immediate deterioration.