I present a highly noninvasive and fast nanoscale thermometer which operates at very low temperatures down to about 10 mK in Lapland! This work appears recently in physical review applied journal.
Bayan Karimi and Jukka P. Pekola, Phys. Rev. Applied 10, 054048 – Published 20 November 2018
https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.10.054048