Grid sensor for two-dimensional measurement of electrical or non-electrical variables of a measurement cross section, essentially comprising - a sensor board made of a dielectric base material with at least one measurement cross section, - wire electrodes spanning the measurement cross section such that they span a grid with at least two parallel planes, wherein the first grid plane on the upper side of the sensor board comprises a set of wire electrodes which are preferably oriented in parallel and do not cross and the second grid plane on the lower side of the sensor board likewise comprises a set of wire electrodes which are preferably oriented in parallel and do not cross and the wire electrodes of the various planes are oriented with respect to each other by an angle greater than 0°, preferably 90°, - an electrically conductive connection (e.g. a conductor track) between each wire electrode and an electric wire connection point or plug connector at the edge of the sensor board, characterized in that - channels which are wider than the diameter of the wire electrodes and have a depth of less than half the thickness of the sensor board run outwardly from the edge of the measurement cross section in said sensor board, - the channels are coated by a metal layer, - the wire electrodes are inserted into the periphery of the measurement cross section with the two ends of said electrode each in one of the opposite channels and said electrodes are fixed in the channels by means of a conductive sealing compound such as brazing solder or soft solder, - in each channel the conductive sealing compound terminates in a planar fashion with the upper side of the sensor board, - the sensor board is clamped between two clamping plates and respectively one flat sealing ring, inserted on the upper and lower side, by means of a few clamping screws arranged on the edge of the sensor. - a sensor board made of a dielectric base material with at least one measurement cross section, - wire electrodes spanning the measurement cross section such that they span a grid with at least two parallel planes, wherein the first grid plane on the upper side of the sensor board comprises a set of wire electrodes which are preferably oriented in parallel and do not cross and the second grid plane on the lower side of the sensor board likewise comprises a set of wire electrodes which are preferably oriented in parallel and do not cross and the wire electrodes of the various planes are oriented with respect to each other by an angle greater than 0°, preferably 90°, - an electrically conductive connection (e.g. a conductor track) between each wire electrode and an electric wire connection point or plug connector at the edge of the sensor board, - channels which are wider than the diameter of the wire electrodes and have a depth of less than half the thickness of the sensor board run outwardly from the edge of the measurement cross section in said sensor board, - the channels are coated by a metal layer, - the wire electrodes are inserted into the periphery of the measurement cross section with the two ends of said electrode each in one of the opposite channels and said electrodes are fixed in the channels by means of a conductive sealing compound such as brazing solder or soft solder, - in each channel the conductive sealing compound terminates in a planar fashion with the upper side of the sensor board, - the sensor board is clamped between two clamping plates and respectively one flat sealing ring, inserted on the upper and lower side, by means of a few clamping screws arranged on the edge of the sensor.