Sterile neutrino ($ u_s$) conversion in meter scale baselines can be sensitively probed using mono-energetic, sub-MeV, flavor pure $ u_e$s from an artificial MCi source and the unique technology of the LENS low energy solar $ u_e$ detector. Active-st
erile {em oscillations} can be directly observed in the granular LENS detector itself to critically test and extend results of short baseline accelerator and reactor experiments.
