Mechanical Bore Gauge without Mechanical Indicator Range 0.32 in to 0.47 in Operation Type Mechanical Contact Style Anvil Dimension Type Inch Includes Indicator No Maximum Measurement - Inch 0.47 in Minimum Measurement - Inch 0.32 in Requires Indicator Yes Accuracy 79 micronin Contact Point Material Carbide Includes Case Yes Series 2425 Compatible Dial Graduations 0.00005 in 0.0001 in 0.001 in Repeatability 20micron in