An electronic sweat sensor (300) includes a plurality of porous substrates (310, 312), each porous substrate (310, 312) having an electrically conductive surface (320, 322). The porous substrates (310, 312) have a generally planar surface. The generally planar surface may be adapted to be positioned on skin (12) generally coplanar with the skin. The electronic sweat sensor (300) further includes a porous spacer (315) layer defining a gap between at least two of the porous substrates (310, 312). When an analyte flow (305), which may be from skin (12), is moving perpendicular to the planar surface and through at least one of the porous substrates (310, 312), at least one of the conductive surfaces (320, 322) provides an electrical response to the presence of the analyte flow (305).
