Recent advances in the development of exfoliated 2D materials and other mesoscopic systems (e.g. semiconducting nanowires) have led to the discovery of intriguing topological, magnetic, and superconducting states. However, many bulk probes which have been invaluable in understanding complex electronic states such as those found in high-temperature superconductors are no longer applicable. Additionally, many scanned probes which can study physics on the nanoscale are incompatible with the highest quality, state-of-the-art 2D materials-based devices which rely on encapsulation with hexagonal boron nitride. In this talk I will present magnetic imaging studies of more traditional mesoscopic systems, including imaging current distributions in micron-scale devices and studying novel nanowire-based superconducting devices. Secondly, I will describe more recent work realizing low-disorder graphene devices which facilitated the discovery of new topological states of matter. Finally, I will discuss prospects for studying 2D materials both with magnetic imaging and on-chip THz spectroscopy using superconductivity in exfoliated flakes as an example.