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Cylinder Bore Gauge - TS-317
The cylinder bore gauge is used to accurately measure the diameter of the cylinder bores in your engine block. It is commonly available with an assortment of extensions to allow measurement of bores from 2 to 6 inches diameter. The dial indicator typically gives readings in 0.0005" increments (half thousandths of an inch). These gauge sets can be moderately priced, sometimes as low as $39 if you search around a bit.