Groz drum level indicator is easy & cost effective means to check level of fluid remaining in a drum / tank. It has a planetary gear mechanism float connected with a string that moves down as the liquid level goes down in the drum. It can be used with wide range of liquids including oil, fuel, water, coolants etc. Note that this is not a precise measuring device. Gauge is only to give an approximate / indicative level of liquid in the drum to know when to arrange for a new drum.
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