A Petroleum Density Tester is an instrument used to measure the density of petroleum products, such as crude oil, gasoline, diesel, lubricants, and other related liquids. Density is a crucial characteristic in the petroleum industry as it affects the quality, performance, and applicability of products for various applications. The density of petroleum products is usually expressed in kilograms per cubic meter (kg/m ³) or grams per cubic centimeter (g/cm ³). It supports quality control, regulatory compliance, blending operations, and research to ensure that petroleum products meet the required specifications and operate as expected.