The invention relates to a refiner (1) for fruit, vegetables or the like, in particular for tomatoes. Said refiner (1) has an inlet (2) for the feed material to be processed and, in a processing chamber, a rotating break-down and separation apparatus (5), which comprises a screening apparatus (7). The feed material is thereby separated into a liquid end-product phase or good phase and a mushy waste phase or reject phase. The good phase is led away via a first outlet (8), and the reject phase is led away via a second outlet (9). In case of said refiner (1), a moisture measurement is performed for the mushy reject phase, near the separation apparatus (5) in respect of process, by means of a moisture-measuring sensor (10) arranged in the outlet region for the mushy waste phase or reject phase (9), the measured moisture content being used for process monitoring and process control. The invention further relates to preferred arrangements of a moisture-measuring sensor (10), and to suitable transmission and data-pr
