I work for an industrial supplier and bought this caliper last year for measuring bore sizes and Outside diameters etc of sprockets, pulleys, and bearings. The good feature is that it converts metric to inch with the touch of a button.Bad: if you turn it off while calipers are opened and then turn it on it starts at 0 and I cannot figure out why this is a good feature.Bad: after less than a year the readout went whacko and turning it on caused the numbers to change arbitrarily about a thousand times a minute! This is too expensive if it is a throwaway, but i learned i cannot be without one. Next time I'll try a more expensive one like Starrett