It is well known in industrial applications involving powders and granular materials that the presence of electrostatic charges influences drastically the material flow properties. The triboelectric charges are produced during flow at the contacts between the grains. Unfortunately, the triboelectric effect is still poorly understood, even at the fundamental level, and most instruments that claim to measure electrostatics do it indirectly.
Therefore, the approach to solving practical problems due to electrostatic is mostly empirical. Moreover, reproducible electrostatic measurements are difficult to perform.
The Granucharge was developed to fill that gap in powder characterization instruments by measuring the electric charge density of a sample with a customized Faraday cup.