Professional Precision Electronic Bore Gauge Deep cylinder bore gageing to a depth of 10" affords the user the ability to measure out-of-round conditions and tapers of cylinders without the necessity of removing pistons - critical wear area of the cylinder can be reached with this gauge. Features: Inch / Metric Measures bore to 10" deep Range 2" to 6" diameter Analog bar display with adjustable rang and tolerance indicators Convenience to indicate measurements whether out of set tolerance or not Fast to read Max. / Min. measurement SPC digital output Resolution: .00005" Large LCD screen ABS storage case and extra batteries included