Disassembly and cleaning of a set of Mitutoyo dial calipers I recently purchased for work. They were calibrated before and after any work was done and were accurate to .001″ throughout their 8″ range. The only real issue was some binding around the 3.5-4.5″ area. This turned out to be nothing more than years of dust and oil residue. Once cleaned and re-oiled, they are practically as good as new.