  We show that the delocalization-localization transition in a quantum-many
body (QMB) systems is a compelling quantum resource for achieving
quantum-enhanced sensitivity in parameter estimation. We exploit the
vulnerability of a near-transition QMB state against the parameter shift for
devising efficient sensing tools. In this realm the main focus of this work is
to identify, propose and analyze experimentally relevant quantum observables
for precision measurement. Taking a QMB system as a Fermi lattice under
quasi-periodic modulation that supports an energy-independent
delocalization-localization transition, we suggest operator-based adiabatic and
dynamical quantum sensors endowed with considerable quantum advantages.
