measuring roller for contacting the underside of the work piece with the roller mounted on a shaft in a tilting arrangement a water supply is provided on the shaft communicating with a channel which extends into the roller and with the roller being open on at least one side thereof application_number US 67546676 A description fig1 illustrates a device 10 for the linear measurement of a hot work piece 12 or of a portion thereof such a linear measurement device is provided as a rule in continuous casting units and in particular in the work piece movement direction of the torch cutting machine illustrated schematically as 100 which serves for the separation of work pieces the measuring device 10 as shown in fig2 is arranged to the side of the roller bed 14 which serves for the further conveyance of the work piece 12 for the prevention of a lateral heat radiation of the hot work piece to the measuring device 10 there is arranged between the latter and the roller bed 14 a protective plate 16 on a basic support 18 fig1 there is arranged a bearing pedestal 20 in which a shaft 22 is turnably supported on the one end of shaft 22 protruding from the side of the bearing pedestal 20 facing the protective plate 16.