Thread: Digital caliper recommendation ??? for comparator use

Beware digital sliding calipers. They sometimes supply you decimal points that they are incapable of reproducibly measuring. You have to fork out a good sum to get some decent ones.

For measuring bullet length or cartridge OAL, get a $20 sliding vernier calipers. The tolerance required will be met and the sliding calipers are quick and easy to use for repeat measurements.

BUT for measuring something small and critical like bullet diameters, then a 0-25mm MICROMETER can be had for less than $20 on ebay, and a cheap micrometer will do better than a fair sliding caliper -- because the micrometer is the correct tool for that particular job. Micrometers give repeatable measurements and for that purpose have a click-over mechanism to ensure the measuring surfaces touch the measured objects with repeatable tension. They can also be re-zeroed, something that is difficult to do with a dropped set of sliding calipers.

https://www.ebay.com/itm/0-25mm-0-01...zJsJ:rk:8:pf:0