A system for presenting a crop sample to a crop property sensor is in particular suited for a harvesting machine and comprises a bypass line branching off from a crop feeding assembly, a conveyor for feeding the branched-off crop through the bypass line without damaging the crop, and a crop property sensor for sensing one or more properties of the crop in the bypass line. The bypass line is upwardly angled or extends vertical, such that the conveyor elevates the material from the crop guiding channel to the crop property sensor.