Radar-based fill level measurement device having a security device

A radar-based fill level measurement device comprising a signal generator for the purpose of generating electromagnetic waves, and an antenna for the purpose of emitting the electromagnetic waves into a container, as well as for the purpose of receiving electromagnetic waves reflected out of the container, further comprising a security device for the purpose of verifying the functional capability or improving the measurement quality of the radar-based fill level measurement device, wherein the security device comprises a reflector and an adjusting device, and is suitably configured to move the reflector at least between a first position, in which it reflects the electromagnetic waves, and a second position, in which it reflects the electromagnetic waves to a reduced degree, wherein the security device has a drive which acts on the adjusting device, wherein the drive is connected to the electronics of the radar-based fill level measurement device, and the reflector moves from the second position into the first position upon request by the electronics, such that it is possible to create an entirely automated process for verifying the proper functioning of the radar-based fill level measurement device.