Dynabrade 51706 .1 hp Straight-Line Pencil Grinder, Rear Exhaust, 35,000 RPM, 1/8" Collet 
Insize 2163-25, DIGITAL SNAP GAGE, thickness 0-1″/0-25mm, tube wall thickness .08″/0-2mm, 6928640315015
$115.24
Resolution .0005″/0.01mm.
Accuracy: ?.0016″.
For thickness and tube wall thickness measurement.
Optional accessory: data output cable.
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