A magnetic levitation densimeter (MLD) is developed to provide precise pressure-volume-temperature (PVT) property standard data for several novel fluids such as non-fluorinated refrigerants, hydrogen and bio-fuels. On the basis of the solid density artifact in which density is traceable to the primary density standard realized by silicon single-crystal spheres, fluid density can be measured by simple Archimedes principle. By using MLD, one can measure fluid density via magnetic coupling which transmit the buoyancy force through the pressure barrier. The bottleneck of this method was the force transmission error of the magnetic coupling to surrounding materials, and it results in an error of about 100 ppm in density measurement. Based on finite element method (FEM) analysis, we have proposed a dual-sinker weight exchanging system. By weighing two density-different sinkers at the same vertical levitation height, fluid density is obtained without any errors related to the magnetism of materials.