A magnetic sensor for checking value documents which are transported, for checking, past the magnetic sensor along a transport direction, characterized in that - the magnetic sensor has at least one first calibrating parameter (Vw) and at least one second calibrating parameter (Vh) independent of the first calibrating parameter/ s, wherein - the first calibrating parameter (Vw) is provided for correcting a magnetic signal of the magnetic sensor which the magnetic sensor, upon the check of a value document, detects from a soft-magnetic magnetic region of the value document to be checked, and - the second calibrating parameter (Vh) is provided for correcting a magnetic signal of the magnetic sensor which the magnetic sensor, upon the check of a value document, detects from a hard-magnetic magnetic region of the value document to be checked, and wherein - the magnetic sensor is arranged for correcting a magnetic signal of the magnetic sensor that the latter detects from a value document to be checked, either with one of the first calibrating parameters (Vw) or with one of the second calibrating parameters (Vh), wherein the magnetic sensor is arranged for correcting a magnetic signal detected from a soft-magnetic region of the value document to be checked with one of the first calibrating parameters (Vw) and for correcting a magnetic signal detected from a hard-magnetic region of the value document to be checked with one of the second calibrating parameters (Vh), and - the magnetic sensor has a data memory in which the at least one first calibrating parameter (Vw) and the at least one second calibrating parameter (Vh) of the magnetic sensor are deposited, wherein the data memory contains information which determines which of the magnetic signals that the magnetic sensor detects from a value document are to be corrected with the first calibrating parameter (Vw) and which of the magnetic signals that the magnetic sensor detects from a value document are to be corrected with the second calibrating parameter (Vh). - the magnetic sensor has at least one first calibrating parameter (Vw) and at least one second calibrating parameter (Vh) independent of the first calibrating parameter/ s, wherein - the first calibrating parameter (Vw) is provided for correcting a magnetic signal of the magnetic sensor which the magnetic sensor, upon the check of a value document, detects from a soft-magnetic magnetic region of the value document to be checked, and - the second calibrating parameter (Vh) is provided for correcting a magnetic signal of the magnetic sensor which the magnetic sensor, upon the check of a value document, detects from a hard-magnetic magnetic region of the value document to be checked, and wherein - the magnetic sensor is arranged for correcting a magnetic signal of the magnetic sensor that the latter detects from a value document to be checked, either with one of the first calibrating parameters (Vw) or with one of the second calibrating parameters (Vh), wherein the magnetic sensor is arranged for correcting a magnetic signal detected from a soft-magnetic region of the value document to be checked with one of the first calibrating parameters (Vw) and for correcting a magnetic signal detected from a hard-magnetic region of the value document to be checked with one of the second calibrating parameters (Vh), and - the first calibrating parameter (Vw) is provided for correcting a magnetic signal of the magnetic sensor which the magnetic sensor, upon the check of a value document, detects from a soft-magnetic magnetic region of the value document to be checked, and - the second calibrating parameter (Vh) is provided for correcting a magnetic signal of the magnetic sensor which the magnetic sensor, upon the check of a value document, detects from a hard-magnetic magnetic region of the value document to be checked, and wherein - the magnetic sensor is arranged for correcting a magnetic signal of the magnetic sensor that the latter detects from a value document to be checked, either with one of the first calibrating parameters (Vw) or with one of the second calibrating parameters (Vh), wherein the magnetic sensor is arranged for correcting a magnetic signal detected from a soft-magnetic region of the value document to be checked with one of the first calibrating parameters (Vw) and for correcting a magnetic signal detected from a hard-magnetic region of the value document to be checked with one of the second calibrating parameters (Vh), and - the magnetic sensor has a data memory in which the at least one first calibrating parameter (Vw) and the at least one second calibrating parameter (Vh) of the magnetic sensor are deposited, wherein the data memory contains information which determines which of the magnetic signals that the magnetic sensor detects from a value document are to be corrected with the first calibrating parameter (Vw) and which of the magnetic signals that the magnetic sensor detects from a value document are to be corrected with the second calibrating parameter (Vh).