CONSTRUCTION:-Often A typical float and board-level indicator would consist of a float, dust-proof pulley housing, pointer cradle with nylon, and 150 mm screen printed aluminum scale. This instrument is an absolutely reliable and accurate system for liquid level measurement in tall overhead tanks.These types of float and board-level indicators basically work on the principle of buoyancy. The float is well connected to the counterweight along with a pointer through flexible wire ropes. The pointer slides along the guide against a graduated scale to indicate corresponding levels inside the tank. APPLICATIONS:-Most often, the floats and board-level indicators find their application in overground and overhead storage tanks. They are also used in storage tanks of petroleum products, like furnace oil, diesel, lube oil, and so on. Also, it is used in the storage of vegetable oils, molasses, silicates, glucose, and so on. In short, the float and board-level indicators are most widely used in all non-hazardous and non-pressurized tanks.