A tool for the primary shaping of a housing for a sensor which is designed to capture, via a sensing element, a physical area that is dependent on a variable to be measured, and to emit an electrical output signal on the basis of the captured physical area, including: —a mold cavity for receiving a material that molds the housing, and the sensing element, and —a box having a wall that bounds the mold cavity, wherein at least a part of the wall that bounds the mold cavity is mounted in a displaceable manner.