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. - Curves of multi test results can be superimposed on one picture to contrast and analyze. Display maximum cooling speed, temperature of maximum cooling speed, cooling speed at 300°C, time etc.