Method for manufacturing a displacement measuring device, the method comprising the steps of: - providing a plate-shaped support basis including two support portions (22, 23) separated by a gap, the support basis being deformable such that the two support portions (22, 23) are displaceable with respect to each other; - arranging a first round accommodation space in a first one of said two support portions, adjacent said gap, perpendicular to the plate-shaped support basis; - arranging a second round accommodation space in a second one of said two support portions, adjacent said gap, perpendicular to the plate-shaped support basis, wherein a virtual line connecting the first accommodation space and second accommodation space defines a sensor orientation direction; - providing a sensor system (27, 28) that comprises a sensor unit and a reference unit, wherein -- the sensor unit comprises a sensor housing and a sensing element mounted in the sensor housing, and -- the reference unit comprises a reference housing and a sensor reference element mounted eccentrically in the reference housing; - inserting the reference unit into the first accommodation space with an insertion displacement direction perpendicular to said sensor orientation direction and perpendicular to the plate-shaped support basis; - placing the sensor unit into the second accommodation space with an insertion displacement direction perpendicular to said sensor orientation direction and perpendicular to the plate-shaped support basis; - adjusting the positioning of the sensor system (27, 28) by rotation of the reference housing about its corresponding rotation axis in the first round accommodation space; - fixating the reference unit and the sensor unit in their corresponding accommodation spaces; - providing a plate-shaped support basis including two support portions (22, 23) separated by a gap, the support basis being deformable such that the two support portions (22, 23) are displaceable with respect to each other; - arranging a first round accommodation space in a first one of said two support portions, adjacent said gap, perpendicular to the plate-shaped support basis; - arranging a second round accommodation space in a second one of said two support portions, adjacent said gap, perpendicular to the plate-shaped support basis, wherein a virtual line connecting the first accommodation space and second accommodation space defines a sensor orientation direction; - providing a sensor system (27, 28) that comprises a sensor unit and a reference unit, wherein -- the sensor unit comprises a sensor housing and a sensing element mounted in the sensor housing, and -- the reference unit comprises a reference housing and a sensor reference element mounted eccentrically in the reference housing; -- the sensor unit comprises a sensor housing and a sensing element mounted in the sensor housing, and -- the reference unit comprises a reference housing and a sensor reference element mounted eccentrically in the reference housing; - inserting the reference unit into the first accommodation space with an insertion displacement direction perpendicular to said sensor orientation direction and perpendicular to the plate-shaped support basis; - placing the sensor unit into the second accommodation space with an insertion displacement direction perpendicular to said sensor orientation direction and perpendicular to the plate-shaped support basis; - adjusting the positioning of the sensor system (27, 28) by rotation of the reference housing about its corresponding rotation axis in the first round accommodation space; - fixating the reference unit and the sensor unit in their corresponding accommodation spaces;