The melt flow index tester is a device that analyzes the flow characteristics of thermoplastic materials by forcing a melted sample through a standardized orifice while maintaining regulated pressure and temperature levels. The resultant flow rate, which is measured in grams per ten minutes, offers important information about the viscosity and processing properties of the material. MFI testers are vital instruments for research and development as well as quality control in sectors like polymer processing and plastics manufacturing.