All thermometers are atom-based.

… We were all thinking it!

Original white paper :
https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.7.L012020

(…) systematic fractional temperature uncertainty of 0.006, corresponding to 2 K at room temperature (…)

Ok, yes : 0.006 x 298 Kelvin ≈ 2 Kelvin
… i am disappointed that such an expensive and large device producers such a useless uncertainty range.

Can’t wait for quantum thermometers to measure temperature even more accurately at the expense of its position in space