Originally Posted by Batesmotel
Bought two this year for my son. He needed them for an engineering class in high school. The six inch will not return to zero when closed. You need to manually zero each time. And both of them can vary each measurement. He has to measure three times and take an average. He only needs them for a few of the assignments so he is making due. Other kids had the same problem.
Maybe mine is older - from back in the days when the Chinese built calipers that hold a zero.