Mechanical Bore Gauge Range 8 in to 12.125 in Dial Graduation 0.0001 in Operation Type Mechanical Contact Style Three-Point Dimension Type Inch Maximum Measurement - Inch 12.125 in Minimum Measurement - Inch 8 in Requires Indicator Yes Accuracy +/-0.0002 in Case Type Case Contact Point Material Steel Includes (3) Extensions Includes Case Yes Series 84 Repeatability 0.0001 in Resolution 0.0001 in