Device for detecting and localising moisture on a moisture-bearing surface and/or in a moisture-bearing layer, comprising: a plurality of electrically conductive conductor paths arranged next to each other; a carrier tape; wherein the conductor paths are fixed to the carrier tape; wherein the carrier tape is configured in such a way that it can be applied to the moisture-conducting surface and/or in the moisture-conducting layer; wherein the device comprises: at least one separating element, wherein the at least one separating element is configured in such a way that the at least one separating element is positionable at a predetermined position on the carrier tape; wherein the at least one separating element is configured such that it can sever at least one predetermined conductor path from the plurality of conductor paths on the carrier tape at the predetermined position on the carrier tape; and wherein the severing of the at least one predetermined conductor path represents an interruption of the electrical contact between the segments (110, 111, 120, 121, 130, 131, 140, 141, 150, 151, 160, 161; 170, 171, 172, 180, 181, 182) of the at least one predetermined conductive path which are located on opposite sides of the predetermined position, characterised in that the at least one separating element comprises a blade or cutting edge; wherein the blade or cutting edge is configured such that it can sever at least one predetermined conductor path from the plurality of conductor paths on the carrier tape at the predetermined position on the carrier tape. a plurality of electrically conductive conductor paths arranged next to each other; a carrier tape; wherein the conductor paths are fixed to the carrier tape; wherein the carrier tape is configured in such a way that it can be applied to the moisture-conducting surface and/or in the moisture-conducting layer; wherein the device comprises: at least one separating element, wherein the at least one separating element is configured in such a way that the at least one separating element is positionable at a predetermined position on the carrier tape; wherein the at least one separating element is configured such that it can sever at least one predetermined conductor path from the plurality of conductor paths on the carrier tape at the predetermined position on the carrier tape; and wherein the severing of the at least one predetermined conductor path represents an interruption of the electrical contact between the segments (110, 111, 120, 121, 130, 131, 140, 141, 150, 151, 160, 161; 170, 171, 172, 180, 181, 182) of the at least one predetermined conductive path which are located on opposite sides of the predetermined position, characterised in that the at least one separating element comprises a blade or cutting edge; wherein the blade or cutting edge is configured such that it can sever at least one predetermined conductor path from the plurality of conductor paths on the carrier tape at the predetermined position on the carrier tape. at least one separating element, wherein the at least one separating element is configured in such a way that the at least one separating element is positionable at a predetermined position on the carrier tape; wherein the at least one separating element is configured such that it can sever at least one predetermined conductor path from the plurality of conductor paths on the carrier tape at the predetermined position on the carrier tape; and wherein the severing of the at least one predetermined conductor path represents an interruption of the electrical contact between the segments (110, 111, 120, 121, 130, 131, 140, 141, 150, 151, 160, 161; 170, 171, 172, 180, 181, 182) of the at least one predetermined conductive path which are located on opposite sides of the predetermined position, characterised in that the at least one separating element comprises a blade or cutting edge; wherein the blade or cutting edge is configured such that it can sever at least one predetermined conductor path from the plurality of conductor paths on the carrier tape at the predetermined position on the carrier tape.