Category of specialized equipment for measuring and evaluating flow characteristics and viscoelasticity of liquids, pastes, and gel substances. Includes viscometers, rheometers, texture analyzers, and other instruments that quantitatively measure material fluidity, viscosity, elasticity, and yield stress for quality control and product development. Essential measurement equipment for formulation optimization, quality assurance, and process control in chemical, food, cosmetics, paint, and resin industries. Unlike simple physical property meters, enables detailed analysis of material behavior under varying shear rates and temperature changes.