"Combination scale" packaging metering device is a metering screw feeder to complete the device uses. In each loading cycle, as long as the precise control of the number of revolutions of the screw, the required measurement can be obtained. Charging of the device a short distance, little flying dust, and fast, "Combination scale" for powder packaging materials. But metering screw machining accuracy and high cost. Mainly by the driving means, the metering screw, hopper, stirrer, and racks and other components. "Combination scale" works as follows: drive and agitator driven metering screw into the metering orifice by feeding tube, after receiving hopper fall into the bag, complete metering automatic blanking requirements.