Mitutoyo 511-932 Dial Bore Gauge, 0.7"-6" Range, 0.0001" Graduation, +/-0.0008" Accuracy Total measurement range of 0.7 to 6" and accurate to + or - 0.0008" Gradient spacing of 0.0001" Rugged cover for dial indicator protection Two-point contact for detection of geometry problems such as ovality and taper Carbide-tipped contact points for extended wear and improved abrasion resistance