we always called calipers guess sticks in the shop. you can get any number you want. .0005 accuracy is laughable but thats what they sell. I wouldnt trust a caliper on close measurements any better than 2-5 thousands. we used them for roughing only. if you want the true measurement and your not experienced with micrometers get a ratchet or slip spindle type micrometer, fowlers are inexpensive and accurate. mititoyos are good. starrets and brown and sharps are my preference but they will cost you. once you get time with them you wont need the ratchet or the slip spindle. get carbide tip later if you end up using them a lot. if you start with carbide tipped mics, be gentle as they chip edges easy. remember these are not fancy c-clamps.

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)