3 Meters K Type Mini-Connector Thermocouple Temperature Probe Sensor Temperature Sensing Line K Type Thermocouple Wire Measure Range -50 to 400 Celsius, Compatible with TM902C/ TES1310 (10 Pieces)

Accurate, cheap. They work perfectly!

When compared to the one that came with my test equipment these measure very close to same temp I was getting from the original one.

Wires are extremely thin: single strand 30 AWG or ~0.25mm. Prob OK for a static run, but I would avoid if the cable has to move much. They are cheap so you can always throw out a broken one and use a new one if it's in a easy place to get to. Also If you are planning on using on a amplifier breakout with wire block connector, these wires will likely be too thin.

We have a very old TC welding machine that we used to make Thermo Couples. It works well and is very handy. I purchased these TCs as a test to see if we could use purchased TCs, if our welder failed. The purchased TCs from this vendor are equal in every way to those we make. I compared the temperature reading with a quality Fluke, handheld meter. The TCs we make (that I trust) read identical to those from the vendor. The only question might be the quality of the insulation. I say “question” because I have not tested the resistance to burning of their fiberglass insulation but it appears to be authentic fiberglass sheathing. I will test heat resistance and update this post.

Nice 30 Gauge wire type-K thermocouples. Listing does not state wire gauge. Generous length that you can use to make more thermocouples. Fiberglass insulation, good for reasonably high temperatures. Sturdy Flame Welded bead. The bead is about 1 mm diameter and is quick to respond. The wire is folded, not looped like the listing shows, so it needs to be straightened. The black polyolefin heat shrink insulation should be removed if you are going to use this above about 150 C. Just carefully slice it with a razor blade and pull it off. The end of the thermocouple is twisted and bent, so it will need to be straightened before use as I have shown in the upper part of the photo. Make sure the bare wires do not touch except at the bead if you need to precisely locate the measurement point. I didn't pull back the outer jacket to see the color coding; it might be non-standard. If you need to check polarity, Alumel is magnetic below 152 °C and is the (-) side. Minus one star for minor correctable deficiencies.