Rheometers are precision instruments used to measure the flow and deformation behaviour of materials, providing critical insights into viscosity, elasticity, and shear properties under various conditions. Unlike simple viscometers, rheometers offer advanced rheological analysis for complex fluids and soft solids, making them essential in industries like polymers, pharmaceuticals, cosmetics, food, and chemicals. By applying controlled stress or strain, rheometers help researchers and engineers optimise formulations, ensure quality, and predict how materials will behave during manufacturing or use.