The problem with the harbor freight calipers is they eat batteries like they are going out of style, and they are not consistently consistent.... I have two from harbor freight, one is always correct, the other is only correct the first time you open it, then you have to close it and re-zero or it measures wrong... same model # just bought at different times.... Both will kill the battery in about a month, even if they are off and not used..... A decent digital caliper will have 1+ year of battery life, even if used on a daily basis, much longer if used infrequently, like for reloading.... Personally, I like a nice dial caliper. Starret, brown and sharp, mititoyo, are what I recommend, but they are spendy... You generally get what you pay for here, but you can get lucky and get a good inexpensive caliper. Start with the jaws closed, open them halfway and them measure a cartridge, close them most of the way, then re-open and measure again, if you cant do that 5 times in a row and always get the EXACT same measurement, they calipers are junk....
This is what I use every day at work
http://www.use-enco.com/CGI/INSRIT?P...&PARTPG=INLMPI but like I said, I use the harbor freight jobbies at home, but only because I cannot find my brown and sharp dial calipers.... I think my 2 year old ran off with them somewhere... ???
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