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"GAYATRI" make Bi-Colour type level indicators are designed, using simple magnetic principle. Level is indicated by changed colour of Bi-colour magnetic rollers. They are mounted on aluminum channel, protected by sturdy aluminum box which is moved by magnetic float in the main pipe chamber. The roller turns upside down changing colour from yellow to red. Thus showing level. It is used at places where there is flammable toxic or high temperature and high pressure fluid where glass type level indicators cannot be used.