We’ve used Frankford Arsenal calipers before. Though they won’t compare to a Mitutoyo, they are adequate for many basic reloading tasks (and measuring targets). You can use these as a backup tool carried in your range bag or vehicle glovebox. These calipers could also make perfect stocking stuffers for family members or shooting buddies who reload. Unlike some of the no-name electronic calipers sold on eBay or at Harbor Freight, these $12.99 Frankford Arsenal calipers are CE-Certified and have a one-year warranty against manufacturing defects.