Thermocouples generate a voltage directly dependent on temperature. They are particularly suited for high temperatures up to 1,700 °C. Instrument designs from mineral-insulated sheathed cable are very resistant against extremely high vibration loads (depending on instrument model, sensor element and wetted materials). For thermocouples, the accuracy classes 1 and 2 apply (standard and special). They are available with a tolerance value in accordance with IEC 60581 / ASTM E230.