Bore Gauge without Digital Indicator Range 7 in to 8 in Resolution 0.00005 in/0.001 mm SPC Output 2124 Actuation Type Pistol Grip Contact Style 3 Point Dimension Type Inch Includes Indicator No Maximum Measurement - Inch 8 in Minimum Measurement - Inch 7 in Operation Type Digital Accuracy +/-0.00028 in Contact Point Material Carbide Includes Extension Rod Repeatability 0.0001 in