Hydrometer for measuring petrol density for petrol Pump purposes and is made of high quality borosilicate glass. They are typically calibrated and graduated with one or more scales such as specific gravity. These hydrometers are manufactured by using high-quality raw materials in strict adherence to industry standards and norms. The density hydrometer is widely used in analytical industries for measuring the density of petroleum liquids. Variant: Petrol (700 -750), Petrol (750 – 800), Diesel (800 – 850), Diesel (850 – 900).