The density and derived quantities such as the specific gravity and API gravity are used worldwide to characterize liquid petroleum products and to compare their quality. Many crude oils, heavy oils, lubricating oils and paraffins are highly viscous or solid at room temperature. Their density is often still determined manually using hydrometers. The METTLER TOLEDOoptional heating devices in combination with oscillating U-tube digitaldensity meters allow density measurements to be automated and performedmuch more rapidly and reproducibly.