3M 45097, Roloc Disc Pad TR, Extra Hard 2 in 1/4-20 Internal, 7000045284 
Insize 4770-300E, PERPENDICULARITY TESTER, 0-12″, 6928640359446
$4,711.56
Optional accessory: dial test indicators, cylinder square ( 4710, for calibration), granite square ( 4141, for calibration).
Range: 0-12″
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