The Vernier scale is on the lower part of the sliding ... of considerably higher quality instruments, a Mitutoyo 103-137 metric model which sells for about £57 ($70), and a vintage 1960s Moore ...

I can use the vernier caliper for this again, as it has both metric and imperial measurements on it. I need to measure the diameter here, the distance across the entire bolt head. That's 13 ...

I can use the vernier caliper for this again, as it has both metric and imperial measurements on it. I need to measure the diameter here, the distance across the entire bolt head. That's 13 ...