Volumetric feeders use an auger or screw conveyor running at a constant speed to discharge granules or powder from a storage hoppers at a consistent rate. They accurately and uniformly in-feed materials for powder handling systems and are made from stainless steel or mild steel. The variable conditioning mechanism and rotating speed can be tailored to suit the specific situation to minimize degradation or material agitation. Special volumetric feeders can be designed to handle poor flowing materials by use of a secondary auger.