Unlimited Ruler / Ruler

There are many problems that we can use clever ways to solve,such as measuring a longer distance,without the tape is hard to achieve.And now,Unlimited Ruler make it easy to measuring a longer distance with a ruler looks like an ordinary one ,but the different is that there is a hole at each end of the Unlimited Ruler,unlimited length can be measured,as long as the fingers insert therein and alternate the holes. Besides,there are regular holes on Unlimited Ruler,putting the nib inserted therein and the corresponding size circle can be drawn.The one side is centimeter and the other is inch , the appropriate size circle can be drawn easily.