How to judge the quality of micrometers and calipers

If the error grows incrementally with opening the mic further, then the screw lead is in error. There is no fixing that, it must be lived with or replaced.
 
I like the craftsman mics from back in the 70s. I'm not sure who made them but they feel nice and they can be had cheap on ebay. I have the big name mics but I always reach for the Craftsman.
 
measure same part many times. It have to give same reading all times. (or it will make you crazy)
smoothness on movement. (it will give you better feeling when taking a measurement)
battery consumption (seems like cheap ones are avid battery consumers)
surface finish (if you care)
durability (long term investment)
Trust (sometimes, things get confusing. You need to trust your meassuring tools)
After all, if you can get it calibrated by a specialized company, it should be good to go.
 
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