This dial micrometer is the one I trust the most in our material house.  It has flat spindle faces that are 6.35 mm in diameter.  Its range is 0 - 10 mm graduated in 0.01 mm.  One dial revolution is equal to 1 mm.  A knurled wheel on top of the tool operates the spindle.  It is supplied in a plastic box.  Being hand-held, it can be brought to the work.