This was very helpful to have on our trip to determine if were within weight limits.  The downside is that you must be very still for somewhere on the order of 10-15 seconds for the number to lock.  After many uses it may have locked only once for us, varying up to two pounds and point levels, ie. 48.8 to 50.2 and such.  Maybe that's because of the sensitivity.  It gave us a general idea, but never an exact number so we played it safe and tried to stay away from triggering the number 50.  Also it is very easy to accidentally change the unit of measure with one button.  Takes a bit to figure out what's happening.