Method for fastening a housing for a measuring device for process or automation technology to a wall, the housing having a quasi-flat rear side with which the housing is to come into direct contact with the wall, and a display for displaying measurement and parameter data being arranged on the front side, the rear side of the housing having at least two keyhole-like recesses with a wide and a narrow region, and one of the side surfaces and/or the top and/or the bottom of the housing having at least two obliquely extending bores which abut with their end against the keyhole-like recesses, characterized by the following method steps: - drilling at least two holes into the wall according to the hole pattern on the rear side of the housing; - screwing a hexagon socket screw into each of these holes, with a distance between the wall and the screw head which corresponds at least to the thickness of the rear side of the housing; - positioning the measuring device housing on the wall in such a way that the screw heads of the screws located in the wall are each guided through the wide regions of the at least two keyhole-like recesses in the rear side of the housing; - pushing downwards or twisting the measuring device housing so that the screw shafts of the at least two screws are each located in the narrow region of the at least two keyhole-like recesses; - inserting a hex key with a ball head into the at least two obliquely extending bores such that the ball head engages in the hexagon socket of the screw head and the screw in question is tightened. the housing having a quasi-flat rear side with which the housing is to come into direct contact with the wall, and a display for displaying measurement and parameter data being arranged on the front side, the rear side of the housing having at least two keyhole-like recesses with a wide and a narrow region, and one of the side surfaces and/or the top and/or the bottom of the housing having at least two obliquely extending bores which abut with their end against the keyhole-like recesses, characterized by the following method steps: - drilling at least two holes into the wall according to the hole pattern on the rear side of the housing; - screwing a hexagon socket screw into each of these holes, with a distance between the wall and the screw head which corresponds at least to the thickness of the rear side of the housing; - positioning the measuring device housing on the wall in such a way that the screw heads of the screws located in the wall are each guided through the wide regions of the at least two keyhole-like recesses in the rear side of the housing; - pushing downwards or twisting the measuring device housing so that the screw shafts of the at least two screws are each located in the narrow region of the at least two keyhole-like recesses; - inserting a hex key with a ball head into the at least two obliquely extending bores such that the ball head engages in the hexagon socket of the screw head and the screw in question is tightened. - drilling at least two holes into the wall according to the hole pattern on the rear side of the housing; - screwing a hexagon socket screw into each of these holes, with a distance between the wall and the screw head which corresponds at least to the thickness of the rear side of the housing; - positioning the measuring device housing on the wall in such a way that the screw heads of the screws located in the wall are each guided through the wide regions of the at least two keyhole-like recesses in the rear side of the housing; - pushing downwards or twisting the measuring device housing so that the screw shafts of the at least two screws are each located in the narrow region of the at least two keyhole-like recesses; - inserting a hex key with a ball head into the at least two obliquely extending bores such that the ball head engages in the hexagon socket of the screw head and the screw in question is tightened.