Digital caliper usage

[TomG]

The concept is interesting, but the execution is flawed. Calipers are not considered precision measuring instruments, especially on round parts and holes. Generally they can't be trusted to any closer than a few of thousandths on such, even in experienced hands. To get a good clearance or interference fit between a shaft and hole, you'll need to use a micrometer on the shaft and telescoping gauges, gauge pins or bore gauges on the hole.

Tom