Description Mitutoyo 511-723 CG-150AX/2109SB-10 Standard Type Dial Bore Gage is one of the many Bore Gages Mitutoyo offers. All 511 Series Bore gages come with interchangeable anvils and necessary accessories to perform close tolerance ID measurements. Additional extention rods are available from 125mm/4.92" to 1000mm/39.37". Specifications Range:50-150mm Graduation:0.001mm Type:Individual Accuracy:2µm/.00008 Specifications:Most popular Bore Gages.Carbide-tipped contact points for durability.Optional extension rods can be attached for measuring deep holes.