yardstick

noun
1
a ruler for measuring one yard
خط‌کش اندازه‌گیری (یک یارد), خط‌کش یارد, یاردسنج
2
a standard used for judging how good or successful something is
معیار, ملاک, محک, سنجه, معیار ارزیابی, مقیاس, معیار سنجش
a yardstick by which to measure something
Exam results are not the only yardstick of a school's performance.