Scales; apparatus for use in weighing material and products transported on conveyor belts to analyze, monitor and regulate material and product flow for inventory, load out and production; devices for controlling electronic weighing systems and for integrating such systems with computer peripherals for data communication; conveyor speed sensing device for use with scales for weighing material and products on conveyor belts; apparatus for use in weighing and metering material and products transported from bins, silos or conveyor belts to analyze, monitor and regulate material and product flow for inventory, load out and production; [ impact weighers; ] apparatus for weighing mass flow rate and total mass of free-flowing materials and products in conveying systems by means of momentum measurements to analyze, monitor and regulate material and product flow for inventory, load out and production; apparatus for weighing mass flow rate and total mass of free-flowing materials and products in conveying systems to analyze, monitor and regulate material and product flow for inventory, load out and production; [ loss-in-weight feeders; ] apparatus for weighing mass flow rate and total mass of free-flowing materials and products in conveying systems by measuring differences in material static weight, to analyze monitor and regulate material and product flow for inventory, load out and production; flow/no-flow detectors; apparatus for detecting and monitoring flow and no-flow conditions in pipelines, ducts and other conduits; apparatus for measuring flow rate of materials and products in conduits or conveyors; apparatus for monitoring and detecting the instantaneous or point level of material or products in bins, silos or other vessels; apparatus for detecting conveyor belt misalignment; electronic apparatus for sending a conveyor stop signal to the conveyor controller; apparatus for detecting and monitoring movement and speed of conveyors and other transport machines; apparatus for monitoring and detecting the continuous level of raw and other materials in bins, silos and other vessels; metal detectors; apparatus for detecting metals in materials and products on a conveyor system; apparatus and controllers therefor for detecting metals in materials and products on a conveyor system