This instrument is designed and made as per Standards GB/T7305 Petroleum oils and synthetic fluids — Determination of demulsibility characteristics, GB/T7605 Determination of demulsibility characteristics of turbine oils in service and ASTM D1401 Standard Test Method for Water Separability of Petroleum Oils and Synthetic Fluids. It is suitable to determine the water separability of petroleum oils and synthetic fluids. It can be widely used in fields of petroleum, electricity, chemical industry, colleges and scientific research institutions.