Mineral-insulation thermocouples are constructed with the element compacted in high-temperature magnesium oxide (MgO) and protected by an integral metal sheath. Thermocouples are available in sizes from 0.02 to 0.5 in. (0.5 to 13 mm) diameter. Termination options are application driven and range from standard male plugs to screw- cover terminal housings. Standard calibration types are K, S, T, E, N, R, S and B.