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Old August 10, 2010, 10:25 AM   #2
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 10,280
A bore air gauge is a precision measuring instrument that uses pneumatic pressure change to indicate bore diameter to very small tolerances. Air gauging is just the using that instrument to measure a bore more precisely than the old dial indicator type bore gauges can. Here's one for sale: http://www.marposs.com/product.php/e...tic_bore_gauge
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