  We present results of a Au-Ge alloy that is useful as a resistance-based
thermometer from room temperature down to at least \SI{0.2}{\kelvin}. Over a
wide range, the electrical resistivity of the alloy shows a logarithmic
temperature dependence, which simultaneously retains the sensitivity required
for practical thermometry while also maintaining a relatively modest and
easily-measurable value of resistivity. We characterize the sensitivity of the
alloy as a possible thermometer and show that it compares favorably to
commercially-available temperature sensors. We experimentally identify that the
characteristic logarithmic temperature dependence of the alloy stems from
Kondo-like behavior induced by the specific heat treatment it undergoes.
