PURPOSE: To execute accurate weighing by combining and adding the weight of objectes measured with plural measuring devices, then discharging the objects whose combined weight is the most similar to the set weight.

CONSTITUTION: Objects to be measured whose weight is not equal each other are fed from a feeder to plural measuring machines 1s and data measured by each measuring machine 1 are entered in a multiprexer 3. When a microcomputer 2 receives a start signal (s) from a packing machine and sends a signal (a) to the multiplexer 3, the measured data are stored in the microcomputer 2 through an A/D converter. The microcomputer 2 combines respectively measured data to add them and selects the combination of combined weight which is the most similar to the set value outputted from the setting part 5. When a discharging signal (b) is sent to the measuring machine 1 with the selected combination, objects in the selected machine is sent for the rapping machine. Thus, highly efficient measurement is performed.