We present the design, properties of a very simple and very easy to make fi
x-point device (FPD) for temperature scale definition below 1 K. The FPD co
nsists of five superconductors Mo, Zn, Zr, Ti and AuIn2 allowing thus to fi
x the temperature scale from 0.915 K down to 200 mK. (C) 2001 Elsevier Scie
nce Ltd. All rights reserved.