Petroleum testing is the analysis during upstream, midstream, and downstream production processes of petroleum products. It is most commonly used to test petroleum product, its product components, byproducts of crude oil, fuel, natural gas, upstream oil and gas and other formats of petroleum. - The instrument is designed for Density, Relative Density (Specific Gravity), or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method. It is used to determine the density of crude petroleum and liquid petroleum. This instrument is a kind of all-in-one machine. The control box adopts humanized design. The control switch adopts light-touch mode. It’s structure is simple and compact. Easy to operate. It equips a hard glass vessel and electric stirrer. The temperature in vessel is uniform. Easy to observe the sample.