A substrate suitable for incorporation into an absorbent article for automatic detection of wetness events therein and/or risk of exudate leakage therefrom, the substrate comprising a first surface capable of being arranged proximal to a body facing side of the absorbent article and a second surface opposite said first surface and capable of being arranged proximal to a garment facing side of said absorbent article, said substrate comprising a plurality of sensor tracks disposed on said first surface and said sensor tracks comprising: at least one central track extending parallel to a length L of the substrate and parallel to a longitudinal axis (y-y) crossing a first end and a second end of the substrate; at least two side tracks (7,8) extending parallel to the central track and oppositely arranged such that the central track extends therebetween; and wetness sensing tracks extending outboard of said two side tracks (7,8) wherein the wetness sensing tracks are in the form of a repeating grid and/or pattern along the length L of the substrate and a dimension substantially perpendicular thereto, wherein said central track, said side tracks (7,8), and said wetness sensing tracks are in electrical communication via one or more shortening elements positioned proximal to said second end and distal from said first end, and wherein the substrate is connectable to a clip-on data processing module at a position proximal to said first end and distal from said shortening elements such to form a closed electrical circuit, for measuring resistance, impedance and/or capacitance therethrough and wherein the sensor tracks comprise an electrically conductive material, and are printed sensor tracks, and wherein said absorbent article is selected from the group consisting of diapers, adult incontinence briefs, training pants, diaper holders and liners, sanitary napkins, surgical bandages, and sponges, and wherein the sensor tracks comprise a carbon-based ink and/or a conductive polymer-based ink. at least one central track extending parallel to a length L of the substrate and parallel to a longitudinal axis (y-y) crossing a first end and a second end of the substrate; at least two side tracks (7,8) extending parallel to the central track and oppositely arranged such that the central track extends therebetween; and wetness sensing tracks extending outboard of said two side tracks (7,8) wherein the wetness sensing tracks are in the form of a repeating grid and/or pattern along the length L of the substrate and a dimension substantially perpendicular thereto, wherein said central track, said side tracks (7,8), and said wetness sensing tracks are in electrical communication via one or more shortening elements positioned proximal to said second end and distal from said first end, and wherein the substrate is connectable to a clip-on data processing module at a position proximal to said first end and distal from said shortening elements such to form a closed electrical circuit, for measuring resistance, impedance and/or capacitance therethrough and wherein the sensor tracks comprise an electrically conductive material, and are printed sensor tracks, and wherein said absorbent article is selected from the group consisting of diapers, adult incontinence briefs, training pants, diaper holders and liners, sanitary napkins, surgical bandages, and sponges, and wherein the sensor tracks comprise a carbon-based ink and/or a conductive polymer-based ink.