ASTM D7777 - 13(2018)e1 Standard Test Method for Density, Relative Density, or API Gravity of Liquid Petroleum by Portable Digital Density Meter.(使用便携式数字密度计测定液体石油产品密度、相对密度或API比重的试验方法)。 IP 559 - 2012 Determination of density of middle distillate fuels - Hand held oscillating U-tube density meter method.(中间馏份燃料 手提振荡U形管密度计法)。