Procedure for the laser-based determination of the level of a medium in a vessel according to a transit time procedure, wherein laser pulses of a predefined pulse width (Tp) are generated, wherein the laser pulses are emitted with a defined emission repeat frequency ( f Pulse) in the direction of the surface of the medium, wherein the defined emission repeat frequency ( f Pulse) of the laser pulses depends on a scan frequency ( f S) in such a way that a number of periods of the scan frequency ( f S) - said number being a whole number - is greater or less than a period duration of the emission repeat frequency ( f Pulse) by a predefined time interval ( T d), wherein this time interval ( T d) is selected in such a way that it corresponds to a desired sample resolution and is less than the period duration of the scan frequency ( f s), wherein the laser pulses are received after reflection at the surface of the medium, wherein the laser pulses reflected at the surface of the medium are scanned with a scan frequency ( f S) in such a way that multiple scan values are recorded per laser pulse and are saved as a sub-echo curve, wherein the saved sub-echo curves are compiled into a total echo curve after a measuring cycle, wherein the predefined dependence between the defined emission repeat frequency ( f Pulse) and the scan frequency ( f s) is implemented by generating a basic frequency ( f), which is greater than the emission repeat frequency ( f Pulse), via a first frequency-generating component, wherein the emission repeat frequency ( f Pulse) is obtained from the basic frequency ( f) by multiplying by a predefined division factor, and wherein the scan frequency ( f S) is generated by means of a second frequency-generating component, wherein a differential frequency ( f diff) is generated on the basis of the basic frequency ( f) and the scan frequency ( f S), wherein said differential frequency is regulated to a constant value, wherein multiple sub-echo curves (SEKx) are recorded depending on the desired resolution or measuring accuracy, wherein the scan values of the individual sub-echo curves (SEKx) are offset in relation to one another by a defined time interval (Δt) on the basis of the basic frequency ( f), the scan frequency ( f S), the differential frequency ( f diff) and the division factor, wherein a measuring cycle is finished after the passage of the differential frequency ( f diff) if the differential frequency ( f diff) has passed through a period and the basic frequency ( f) and the scan frequency ( f S) are in phase again, and wherein the level is determined using the total echo curve. wherein laser pulses of a predefined pulse width (Tp) are generated, wherein the laser pulses are emitted with a defined emission repeat frequency ( f Pulse) in the direction of the surface of the medium, wherein the defined emission repeat frequency ( f Pulse) of the laser pulses depends on a scan frequency ( f S) in such a way that a number of periods of the scan frequency ( f S) - said number being a whole number - is greater or less than a period duration of the emission repeat frequency ( f Pulse) by a predefined time interval ( T d), wherein this time interval ( T d) is selected in such a way that it corresponds to a desired sample resolution and is less than the period duration of the scan frequency ( f s), wherein the laser pulses are received after reflection at the surface of the medium, wherein the laser pulses reflected at the surface of the medium are scanned with a scan frequency ( f S) in such a way that multiple scan values are recorded per laser pulse and are saved as a sub-echo curve, wherein the saved sub-echo curves are compiled into a total echo curve after a measuring cycle, wherein the predefined dependence between the defined emission repeat frequency ( f Pulse) and the scan frequency ( f s) is implemented by generating a basic frequency ( f), which is greater than the emission repeat frequency ( f Pulse), via a first frequency-generating component, wherein the emission repeat frequency ( f Pulse) is obtained from the basic frequency ( f) by multiplying by a predefined division factor, and wherein the scan frequency ( f S) is generated by means of a second frequency-generating component, wherein a differential frequency ( f diff) is generated on the basis of the basic frequency ( f) and the scan frequency ( f S), wherein said differential frequency is regulated to a constant value, wherein multiple sub-echo curves (SEKx) are recorded depending on the desired resolution or measuring accuracy, wherein the scan values of the individual sub-echo curves (SEKx) are offset in relation to one another by a defined time interval (Δt) on the basis of the basic frequency ( f), the scan frequency ( f S), the differential frequency ( f diff) and the division factor, wherein a measuring cycle is finished after the passage of the differential frequency ( f diff) if the differential frequency ( f diff) has passed through a period and the basic frequency ( f) and the scan frequency ( f S) are in phase again, and wherein the level is determined using the total echo curve.