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.

2008 Speedy, AI removed, DIY airbox destruction with K&N filters, spectres, re-jetted and "custom" rattle can paint job.