... and diameters, such as high temperature furnace thermocouples. Mineral insulated cable for thermocouple use: Measure range: K, E, J, T, N, Outer ... : Class A or Special Core: Simplex, Duplex, TriplexSample1 MI thermocouple with J extension wireMI cable for RTD use:Conductor: Ni,CuOuter dia.: 2 ...