A common mode noise sensor with a single amplification path is disclosed. The apparatuses comprise at least one module, each of the module comprising at least two electrodes adapted to submit the substance to an electric current. Conductive tags on the exterior of the packet are electrically connected to electrodes on the interior of the packet through reverse-patched regions of the packet’s sidewalls. The VIG unit may be partially embedded or supported in the insulative frame, so that the insulating frame separates the VIG unit inboard lite from the outboard lite thereby reducing conductivity around the edges of the window unit so that R-value can be increased. The account recovery key may comprise a plurality of words that may be supplied to regain access to an account on a protected system if the account has been lost due to the actions of a malicious user or if the password to the account has been forgotten by the user. The impeller is radially constrained in rotation by magnetic coupling to one or more motor stators and is axially constrained in rotation by one or more hydrodynamic thrust bearing surfaces on the impeller.