हाइड्रोमीटर
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thumb|150px|haidromitar haidromitar (aangrezi:Hydrometer) ek vaijnanik upakaran hai. is upakaran ke dvara dravoan ka apekshik ghanatv jnat karate haian.
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thumb|150px|haidromitar haidromitar (aangrezi:Hydrometer) ek vaijnanik upakaran hai. is upakaran ke dvara dravoan ka apekshik ghanatv jnat karate haian.
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