  In most quantum sensing schemes, interactions between the constituent
particles of the sensor are expected to degrade sensitivity. We show that the
phenomenon of many-body scarring can be exploited for quantum sensing that is
robust against certain strong interactions. In the ideal case of perfect scars
with harmonic energy gaps, the optimal sensing time can diverge despite the
strong interactions. We demonstrate the idea with two examples: a spin-1 model
with Dzyaloshinskii- Moriya interaction, and a spin-1/2 mixed-field Ising
model.
