ASTM D4052 - 18a Standard Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter (數字密度計測定液體密度,相對密度和API度的試驗方法) 。 ASTM D5002 - 19 Standard Test Method for Density and Relative Density of Crude Oils by Digital Density Analyzer (數字密度分析儀用原油密度和相對密度的測試方法)。 EN ISO 12185:1996 Crude petroleum and petroleum products — Determination of density — Oscillating U-tube method (原油和石油產品-密度測定-振蕩U形管法)。 EN ISO 15212-1:1999 Oscillation-type density meters — Part 1: Laboratory instruments (振蕩型密度計 第1部分: 實驗室儀器)。