The purpose of verifying or calibrating liquid measurement devices is to ensure the accuracy of quantities being reported. With millions of dollars at stake, fractions of an inch or tenths of a degree Fahrenheit can make quite an impact to bottom line. At its most basic, the static (as opposed to dynamic, the use of meters) quantity determination of liquid hydrocarbons is generally obtained by measuring the depth of the liquid in a storage tank and obtaining a representative temperature. Through the use of volume tables and volume expansion factors the quantity at a standard temperature can be stated.