  We show that evaporating lead (Pb) directly on graphene can create
high-yield, high-quality tunnel probes, and we demonstrate high magnetic
field/low temperature spectroscopy using these probes. Comparisons of Pb, Al
and Ti/Au probes shows that after oxidation a well-formed self-limited tunnel
barrier is created only between the Pb and the graphene. Tunneling spectroscopy
using the Pb probes manifests energy-dependent features such as scattering
resonances and localization behavior, and can thus be used to probe the
microscopic electronics of graphene.
