  We report measurements of a tunable double quantum dot, operating in the
quantum regime, with integrated local charge sensors. The spatial resolution of
the sensors is sufficient to allow the charge distribution within the double
dot system to be resolved at fixed total charge. We use this readout scheme to
investigate charge delocalization as a function of temperature and strength of
tunnel coupling, showing that local charge sensing allows an accurate
determination of interdot tunnel coupling in the absence of transport.
