Method for THz measuring a measurement object, comprising at least the following steps: - phase of a pre-measurement, - determining whether a measurement object has been detected, - if the measurement object has been detected, determining a current distance (d) of a THz measuring device or a THz transceiver from a boundary surface of the measurement object, - comparing the determined current distance (d) with a distance limit (d_tres), and - if the distance limit (d_tres) has not been exceeded, subsequently initiating a main measurement or indicating the initiation of the main measurement, - phase of the main measurement in which a main measurement THz transmission beam having a main measurement bandwidth is emitted along an optical axis towards the measurement object and reflected THz radiation is detected, whereby, using the emitted main measurement THz transmission beam and the detected reflected THz radiation, a measurement of geometric characteristics or material characteristics of the measurement object is carried out, - putting out the measurement result, characterised in that in the phase of pre-measurement a first THz transmission beam of the THz transceiver of the THz measuring device is emitted, in a first frequency range and having a first bandwidth, along the optical axis towards the measurement object and THz radiation reflected off of the boundary surface of the measurement object is detected, and in the phase of main measurement the main measurement transmission beam is emitted as second transmission beam, whereby the main measurement bandwidth of the main measurement transmission beam is larger than the first bandwidth, where the THz radiation (12, 112, 212) lies in a frequency range between 0.01 and 10 THz. comprising at least the following steps: - phase of a pre-measurement, - determining whether a measurement object has been detected, - if the measurement object has been detected, determining a current distance (d) of a THz measuring device or a THz transceiver from a boundary surface of the measurement object, - comparing the determined current distance (d) with a distance limit (d_tres), and - if the distance limit (d_tres) has not been exceeded, subsequently initiating a main measurement or indicating the initiation of the main measurement, - phase of the main measurement in which a main measurement THz transmission beam having a main measurement bandwidth is emitted along an optical axis towards the measurement object and reflected THz radiation is detected, whereby, using the emitted main measurement THz transmission beam and the detected reflected THz radiation, a measurement of geometric characteristics or material characteristics of the measurement object is carried out, - putting out the measurement result, - phase of a pre-measurement, - determining whether a measurement object has been detected, - if the measurement object has been detected, determining a current distance (d) of a THz measuring device or a THz transceiver from a boundary surface of the measurement object, - comparing the determined current distance (d) with a distance limit (d_tres), and - if the distance limit (d_tres) has not been exceeded, subsequently initiating a main measurement or indicating the initiation of the main measurement, - phase of the main measurement in which a main measurement THz transmission beam having a main measurement bandwidth is emitted along an optical axis towards the measurement object and reflected THz radiation is detected, whereby, using the emitted main measurement THz transmission beam and the detected reflected THz radiation, a measurement of geometric characteristics or material characteristics of the measurement object is carried out, - putting out the measurement result, characterised in that in the phase of pre-measurement a first THz transmission beam of the THz transceiver of the THz measuring device is emitted, in a first frequency range and having a first bandwidth, along the optical axis towards the measurement object and THz radiation reflected off of the boundary surface of the measurement object is detected, and in the phase of main measurement the main measurement transmission beam is emitted as second transmission beam, whereby the main measurement bandwidth of the main measurement transmission beam is larger than the first bandwidth, where the THz radiation (12, 112, 212) lies in a frequency range between 0.01 and 10 THz.