1- Formerly, as a measuring tool, the yardstick represented correctness and rigidity. Since metrication and the changes that are taking place in the everyday world, it has less significance. It still, however, represents good judgement.
2- The yardstick represents the measurement of acceptable standards. In dreams this may represent standards of behaviour, belief or conformity.
3- Spiritually a yardstick symbolises the standards that we have set ourselves. We may wish to be re-assured that we are maintaining these standards fully.... Ten Thousand Dream Dictionary