Mineral Insulated Cable, from dia 0.25mm to 12. ... diameters, such as high temperature furnace thermocouples. Mineral insulated cable for thermocouple use: Measure range: K, E, J ... Special Core: Simplex, Duplex, TriplexSample1 MI thermocouple with J extension wireMI cable for RTD use:Conductor: Ni,CuOuter ... or Special Core: Simplex, Duplex, TriplexSample 2 MI RTD with connector Mineral Insulated Cable