We have developed a device containing five superconductive materials W, Be, Ir, AuAl2 and AuIn2 which provides reference temperatures at 0.015 K, 0.024 K, 0.0975 K, 0.159 K and 0.204 K respectively. The reproducibility of three devices each containing these five superconductors was found to vary from 0.1 to 0.4 mK except for Be where it was 1 mK