The Top Mounted Bicolor Roller Type Magnetic Level Indicator provides a clear, reliable, and maintenance-free way to monitor liquid levels in storage tanks and process vessels. It operates on a simple float and magnet principle, where the float rises and falls with the liquid level. A bi-color roller display is magnetically actuated, showing red for liquid and white for vapor space, ensuring visibility even from a distance. It is widely used in refineries, chemical plants, water treatment facilities, and power stations for continuous level indication without the need for external power.