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A relic lepton asymmetry orders of magnitude bigger than the baryon one mayhide in the relic neutrino background. No direct theoretical or experimentallimitations on its magnitude and sign are known. Indirect cosmologicalconstraints exist ranging from $|L|<0.01$ to $L<10$. We discuss a BBN modelwith late electron-sterile neutrino oscillations which is a fine leptometer -it is capable of feeling extremely small relic lepton asymmetry -$|L|>10^{-8}$. This sensitivity is achieved through the influence of such small$L$ on the neutrino oscillations, suppressing or enhancing them, and thuschanging the primordially produced $^4He$. The influence of $L$ on nucleonsfreezing in pre-BBN epoch is numerically analyzed in the full range of theoscillation parameters of the model and for $ L \ge 10^{-10}$. The case ofoscillations generated asymmetry by late electron-sterile oscillations and itseffect on primordial $^4He$ is also briefly discussed.

BBN with Late Electron-Sterile Neutrino Oscillations - The Finest Leptometer