gauger

/ˈɡeɪdʒər/
noun
  1. A person who measures or inspects something, especially a government official who measures the contents of casks or containers for tax purposes.
    • The gauger came to the distillery to measure the barrels of whiskey for tax assessment.
    • The gauger's job was to ensure that the correct amount of tax was paid on the goods.
    • In the 18th century, a gauger would check the volume of imported wine at the port.