RTD probes provide one of the most accurate methods of temperature measurement in industry today. All MTI RTD elements are made with pure platinum wire and high purity ceramic components. MTI manufactures these units in a variety of sheath sizes and materials. Our units are available in 2,3, and 4 wire designs: as well as single, dual and even triplex constructions. Sheath diameters range from .125" thru .500" OD and mineral insulation is provided for mechanical vibration or high temperature applications.