... control system pneumatic operating 2/3 hooper for stone and sand 1200L weight hooper HPD1200 Concrete Batching MachineHPD1200 batching ... complete the distribution of materials, such as sand, stone, etc. and print the actual result of batching at any time. ... ’s suitable for batching sand and stone, such as building site, road, bridge, water conservancy, and concrete component factory, etc. HPD1200 ...