Weighing scales and weighing instruments, namely, electrical dosing apparatuses and weighing-out apparatuses, namely, weight feeders, loss-in-weight feeders, solids flow meters, mass flow meters, and multiple-feed dosing stations, all for weighing materials to be weighed; and parts of weighing scales, parts of weighing instruments and parts of dosing apparatuses, namely, pre-feeders for feeding materials to be weighed, vibration feeders for feeding materials to be weighed, feed hoppers for feeding materials to be weighed, dosing chutes for dosing materials to be weighed, dosing sluices for dosing materials to be weighed, mixers for mixing materials to be weighed, weighing controllers for controlling and carrying out the weighing of materials to be weighed, weighing electronics modules for controlling and carrying out the weighing of materials to be weighed, weight transducers for providing electrical signals responsive to the weight of materials to be weighed, load cells for providing electrical signals responsive to the weight of materials to be weighed, level controls for controlling the level of materials to be weighed, housings for housing said weighing scales and said weighing instruments and said parts thereof, and flow meter impact plates for ascertaining the flow rate of materials to be weighed