Question

If you were buying a piece of cloth, would you want the seller to use his arm or the meter stick to measure the length of cloth?

Answer 1

1. When someone uses arms for measuring lengths there are a lot of chances of errors in measuring since arm length is not a standard tool for measuring because every person has different arm lengths.
2. Therefore buying a piece of cloth we will want the seller to use a meter stick instead of his arms.

Hence the answer is meter stick.