Abstract: An impact flow scale includes a first tube, disposed substantially vertically a second tube, disposed with a downward inclination and having an inlet at an upper end thereof and a lower end of the second tube connected to the first tube, where the first and second tubes permit material communication therebetween. The impact flow scale also includes an impact plate that is hingedly suspended at or near an upper end of the first tube. A material flow path is defined from the second tube through the first tube. The impact plate is adjustably positioned in the material flow path such that materials moving along the material flow path are capable of contacting the impact plate. A sensor disposed outside the first tube is operably connected to the impact plate, thus permitting detection of a horizontal force component generated as materials move along the material flow path.