Answer / kashif

Level troll is used for measuring level of one liquid in vessel and interface level troll is used for more than one liquid commonly for two liquid having different S gravitates i.e Water and Condensate.

Answer / faiyaz

its working in the Archimedes principle generally used in closed tank the lose of weight of the body immersed in liquid total liquid equal to the displaced by the body level troll is used in single liquid and interface level troll is used in two liquid that is called level troll and interface level troll

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