yardstick

/ˈjɑrdˌstɪk/
noun
  1. A standard or criterion used for judging or measuring something.
    • The company's safety record became the yardstick for the entire industry.
    • Many people use test scores as a yardstick for intelligence, but that can be misleading.
    • Customer satisfaction is the main yardstick for measuring our success.
  2. A measuring stick that is one yard (36 inches) long.
    • In the classroom, the teacher used a yardstick to show how long a yard really is.
    • She marked the fabric with chalk and checked the length with a yardstick.
    • The carpenter pulled a yardstick from his apron to measure the board.