The PVT system is designed to study phase behavior of hydrocarbon fluids at reservoir conditions of pressure and temperature. It can be used to perform PVT tests on black oil, volatile oil and etc. The system uses an embedded high pressure pump to control the pressure and volume of the reservoir fluid in the cell. The unit can be configured by inverting the position of the cell using the rocking system. A video camera system capable the operator to determine the gas/liquid interfaces. A magnetic coupled stirrer mounted inside the sample chamber provides efficient fluid mixing and ensures fast equilibrium of sample phases. Homogeneous sample heating is provided by a controlled temperature jacket.