Starrett 644JZ 644 Series Dial Depth Gauge, Indicator Type, 0 3" Range, 0.001" Graduation, With Case, 1 GRAD for first 2 1/2 REVS Accuracy

Measurement range for each model in series of 0 to 3", and resolution of 0.001" Dial gauge provides precise and easily readable measurements Includes three round-end contact points to cover the measuring range Bases are hardened and ground for durability and accuracy Choice of two models: one with a case and one without