my personal choice is Mitutoyo digital at about $100.00 for 6 inch model
will measure to about .0005 with proper feel and extreme care
old school says anything closer than +/- .005 use
a micrometer ...

as much as I prefer Starrett or Brown and Sharpe IF made in USA for most measuring instruments
when it comes to digital they got way too complex with more features and nonsense ... almost impossible to use