Polarized plug and jack assembly bodies are made from molded glass-filled thermoset compounds, with contacts constructed of thermocouple alloy materials. Polarity marks are molded in the bodies for installation assistance, and male and female assemblies are color coded with ISA calibration coding. A metal ferrule tube adapter secures the probe in place, and a wire clamp is used to hold the wire on mating connector. Standard assemblies are designed to operate in temperatures up to 300°F (150°C). High temperature assemblies operate up to 800°F (427°C) and are color-coded red. Individual plugs, jacks, tube adapters and wire clamps are also available.