Do not rely on this digital caliper for accurate measurements.  Unfortunately my return window has closed so it is a just a loss for me.  I really do not understand the high ratings from some people.  I took measuring bars from Rockler and used the calipers on them.  I would continuously get a different measurement simply by remeasuring the exact same brass bar from the same place on the caliper.  Sometimes as much as 0.01 (note that is hundredth, not thousandth) in difference.  Mostly I would see about 0.003 to 0.005 in difference by simply measuring and remeasuring the same brase bar.  It simply is not consistent.