There is a growing demand for experiments on calorimetric and thermal transport measurements at ultra-low temperatures below 1 mK and high magnetic fields up to 16 T. Particularly, milligram-sized solid samples are of great interest. We present the development of scalable thermometers based on quartz tuning fork resonators immersed in liquid [Formula: see text]He and adapt hydrodynamic models to provide an improved description of temperature dependence in the high viscosity regime between [Formula: see text] and [Formula: see text]. We demonstrate successful thermometer operation and discuss the feasibility of fast and compact thermal probes suitable for small samples.
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