Mechanical Bore Gauge Set with Mechanical Indicator Range 0.7 in to 6 in Dial Graduation 0.0005 in Operation Type Mechanical Dimension Type Inch Maximum Measurement - Inch 6 in Minimum Measurement - Inch 0.7 in Number of Gauges 3 Requires Indicator Yes Accuracy +/-0.00075 in +/-0.0009 in Contact Point Material Steel Series 2824 Repeatability 0.00015 in