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

700°C is a problem for many thermocouples. Type K Alloy Wire: Chromel/Alumel (trademarks of Concept Alloys, Inc.) is rated at 1260 degrees C. Insulation is the limiting factor. They "look like" some type of ceramic fiber insulation, which is "high temp," depending on what it is. I only need half of the specified maximum temperature. I need to get to 640 degrees Fahrenheit, not 1292 degrees Fahrenheit. I guess I'll see how they hold up and update later. Yes, the heat shrink tubing will melt since it's likely polyolefin plastic. The heat shrink tubing prevents wear of the ceramic fiber during installation and does not need to be removed immediately after installation. If you move them constantly, wear and tear is a problem and ceramic fibers are not breathable as your body may mistake them for asbestos. The price is great, but the quality of the welds could be better. The hot junction is a naked ball, so fast but fragile. I put mine in a stainless steel tube. You can buy them with the tube installed if you want. With liquids, even water, the ceramic fiber does not hold the liquid and this can change the calibration or eventually lead to failure. The same applies to hot gases such as flue gases.