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Honestly, if it's a tool you'll use every once in a while and not everyday, the harbor freight digital caliper and mic is just fine. I've been working with people who have those and we check them every once in a while to mine and it's dead on. Good thing about them is they are so cheap that if it's off you just toss it and get a new one.



My General Tool caliper holds zero. My HF caliper doesn't.