This category encompasses specialized measuring instruments for determining the viscosity of liquids in manufacturing processes. It includes essential equipment groups for quality control and process control of fluid materials such as paints, inks, resins, oils, and chemicals. Products range from various measurement methods including rotational viscometers (Brookfield type), vibrational viscometers, capillary viscometers, and falling ball viscometers, covering specifications from handheld to benchtop to inline types. These instruments quantify viscosity characteristics during raw material inspection, intermediate quality control, and final product testing in manufacturing sites, achieving product quality stabilization and process optimization. Temperature compensation models and automated measurement systems are included, clearly distinguished from other fluid measurement instruments (flow meters, density meters) by their measurement parameters.