This category encompasses specialized equipment for quantitative measurement and evaluation of powder flowability. In manufacturing processes for pharmaceuticals, food products, chemicals, ceramics, and metal powders, these instruments measure powder flow characteristics, angle of repose, compressibility, and adhesion properties. Includes powder flow testers, angle of repose analyzers, tap density meters, and shear testing machines, essential for quality control, formulation design, and process optimization. Unlike particle size distribution analyzers or surface area measurement devices, these provide specialized evaluation focused on powder flow behavior.