Coil unit of a vibration sensing element or vibration exciter of a sensor or measuring device designed to measure a density or a mass flow of a medium flowing through at least a measuring tube of the sensor or measuring device, said unit comprising: a printed circuit board with at least a printed circuit board layer , wherein each printed circuit board layer has a first side (3.1) and a second side (3.2) that is in a parallel plane to the first side, at least one coil designed to measure or generate a magnetic field that varies over time, wherein the coil is at least partially formed by means of an electrically conductive conducting path (4.3), wherein the coil is arranged on the first side and/or the second side of a printed circuit board layer, wherein the at least one coil has a first coil end (4.1) and a second coil end (4.2), characterized in that the coil unit comprises four contact elements , wherein a first pair of contact elements (5.1) is electrically connected to a first coil end via a first connection, and wherein a second pair of contact elements (5.2) is electrically connected to a second coil end via a second connection, wherein the printed circuit board has a sectional plane (SE) perpendicular to the sides, wherein the sectional plane respectively assigns the sides a first side (S1) and a second side (S2), wherein, in each case, a contact element of each pair of contact elements is arranged on the first side and a contact element of each pair of contact elements is arranged on the second side, wherein the coil unit can be connected to an electronic measuring/operating circuit of the measuring device by means of at least one contact element of the first pair and of the second pair. a printed circuit board with at least a printed circuit board layer , wherein each printed circuit board layer has a first side (3.1) and a second side (3.2) that is in a parallel plane to the first side, at least one coil designed to measure or generate a magnetic field that varies over time, wherein the coil is at least partially formed by means of an electrically conductive conducting path (4.3), wherein the coil is arranged on the first side and/or the second side of a printed circuit board layer, wherein the at least one coil has a first coil end (4.1) and a second coil end (4.2), characterized in that the coil unit comprises four contact elements , wherein a first pair of contact elements (5.1) is electrically connected to a first coil end via a first connection, and wherein a second pair of contact elements (5.2) is electrically connected to a second coil end via a second connection, wherein the printed circuit board has a sectional plane (SE) perpendicular to the sides, wherein the sectional plane respectively assigns the sides a first side (S1) and a second side (S2), wherein, in each case, a contact element of each pair of contact elements is arranged on the first side and a contact element of each pair of contact elements is arranged on the second side, wherein the coil unit can be connected to an electronic measuring/operating circuit of the measuring device by means of at least one contact element of the first pair and of the second pair. <EOS>