The preparation of construction materials often requires to redial a product (mixture of different sizes or categories of stones, etc. This process requires the use of continuous weighing systems. This belt scale associated with one of our weighing indicator form the perfect autonomous measurement chain. It allows a reconstitution of the different granulometry of the expected product. At the end of the conveyor belt, the belt scale can also control the real quantity loaded in the truck. In some cases, using a belt scale on a conveyor belt avoids the addition of a weighbridge.