This SR-4052A-450A auto densimeter adopts single U-tube vibration principle to quickly measure liquid density and relative density. It needs only a little of sample (2~3ml). Regarding test methods, it applies to multiple international standards such as ASTM D4052 - 11 Standard Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter, ASTM D5002 - 13 Standard Test Method for Density and Relative Density of Crude Oils by Digital Density Analyzer, ASTM D3505 - 12e1 Standard Test Method for Density or Relative Density of Pure Liquid Chemicals, ISO 12185 : 1996 Crude petroleum and petroleum products-Determination of density-Oscillating U-tube method, and so on.