Mineral insulated thermocouples are used in the industry to measure temperatures at difficult-to-reach places, since they are extremely flexible and allow a high degree of measurement accuracy. High-quality thermocouples also have a long life time. This is an indispensable product with a large variety of applications in industry and research. Some compositions are as a standard design, but most sheathed thermocouples are produced customer-specific in all conceivable designs. The composition of an individual thermocouple is remarkably simple and comprises six parameters.