Mechanical Bore Gauge Set without Mechanical Indicator Range 1.4 in to 6 in Operation Type Mechanical Dimension Type Inch Includes Indicator No Maximum Measurement - Inch 6 in Minimum Measurement - Inch 1.4 in Number of Gauges 2 Requires Indicator Yes Accuracy +/-0.0009 in Contact Point Material Steel Series 2824 Compatible Dial Graduations 0.0005 in Repeatability 0.00015 in