These PRTs feature an accuracy of <0.015°C and short-term stability of <0.007°C. To reach the best performance in stability and repeatability, the sensing element has been specially designed to protect the platinum sensing wire from contamination at high temperatures. A unique supporting structure and filling material provide the best balance among the hysteresis effect, mechanical shock, and thermal shock performance. This high-performance probe fully meets the ITS-90 criteria for reference thermometers.