I have been using Mitutoyo calipers since about 1977. I like the 8" .100/Rev mechanical versions for my personal use since it has enough room for large hands even when opened 3 or 4 inches They will last forever if well cared for. I have also handled and used Helios, Brown and Sharpe, Starrett, NSK and a number of others. Most of these other brands are not very durable in terms of decades of use. You only find that out by talking to the guy that runs the metrology lab and he used to work for me.