The ETB-255 Two Port Network Trainer is a comprehensive educational tool designed to study the parameters and behavior of two-port electrical networks. It allows students to experimentally determine Z, Y, h, g, and ABCD parameters and analyze different network configurations such as T, π (pi), and lattice networks. The trainer includes an in-built power supply, signal source, and test points for easy connection and measurement. It is ideal for circuit theory and network analysis labs in electrical and electronics engineering courses.