The ohmic value of a cell or unit reading can be reported as Resistance, Impedance or Conductance and which value reported is dependent on the perturbation method used. If a DC source is used, the value reported will be a Resistance. If an AC source is used, the value will be reported as Impedance. Both these methods are reporting the change in ohmic value as an increase in the opposition to current flow, whereas Conductance, which is the reciprocal of Resistance, will report the value in siemens or mhos and the value will drop as the battery ages. In the thirty plus years that ohmic values have been part of a battery maintenance program, while the individual test equipment manufacturers have promoted the value of their specific method and while the values reported will be different, their ability to identify the level of change is virtually the same. The Vigilant uses a DC perturbation pulse, so it reports the value as a resistance.