Top-range seismic/accelerometric digitizer equipped with 24-48-72-96 embedded channels for active and passive seismic surveys, dynamic investigations and buildings dynamic studies. X820S is the ideal solution for every kind of active and passive seismic survey: surface seismic investigations such as Refraction, Reflection (P and S waves), M.A.S.W. , Re.Mi. , E.S.A.C., bore-hole surveys such as Down Hole and Cross Hole, stand-alone passive station H.V.S.R. and vibrational monitoring.