Free: Contests & Raffles.
here is the one I've used for years!http://www.midwayusa.com/product/604242/frankford-arsenal-electronic-caliper-6-stainless-steelIf money is not a problem, by all means buy the higher end brands ITS just like why some people like Savage arms others like Brownings
This is the one and only caliper I've been using for 32 years:http://www.midwayusa.com/product/128288/lyman-dial-caliper-6-stainless-steel
Me and RB used to work in machine shops with tolerances within' a half a thousands so we can't help the suggestion of higher end calipers