  Weak value (WV) protocols may lead to extreme expectation values that are
larger than the corresponding orthodox expectation values. Recent works have
proposed to implement this concept in nano-scale electronic systems. Here we
address the issue of how one calibrates the setup in question, maximizes the
measurement's sensitivity, and extracts distinctly large WVs. Our concrete
setup consists of two Mach-Zehnder interferometers (MZIs): the "system" and the
"detector". Such setups have already been implemented in experiment.
