An auto-ranging nanoAmp meter from LowPowerLab:
CurrentRanger is a nanoAmp current meter featuring auto-ranging, uni/bi-directional modes, bluetooth data logging options and more.
It is a highly hackable and affordable ultra low-burden-voltage ammeter, appropriate for hobby and professional use where capturing fast current transients and measurement precision are important.
More details on LowPowerLab site.
Check out the video after the break.