Based on 20years’ experience in petrochemical industry, Qingdao Aubon has conquered themeasurement technology of micro-vibration cylinder, which has made a greatbreakthrough in the accuracy of on-line density measurement of storage tanks.The accuracy of density measurement can reach 0.0003g/cm³, and theaccuracy of temperature measurement can reach 0.1 ℃. The accuracy is notaffected by the pressure and temperature, and can continuously on-line measureliquid density and temperature, and automatically convert standard density,weight density, VCF and so on, which is the most accurate online densitymeasurement method.