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This seems confusing. The rEvo Shearwater Controller will monitor three cells and use Drager P-ports to plug into the inhale/exhale lungs. It is an independent system so there is no redundancy in this kit by itself, but the standard ppO2 monitor (i.e., Dreams) will provide that.
Yes the Shearwater monitor three cells. But in the "upgrade kit" there is only one. Three other are yet in the rEvo. Total is four cells.
If you buy directly a e-rEvo, you have four cells in the breather.