Measure radius of external arc, arc angle of measured surface should be larger than 90?
Resolution .0005″/0.01mm
Buttons: on/off, set, inch/mm, preset (+, -)
Automatic power off, move the digital unit to turn on power
Battery CR2032, Data outputMade of stainless steel
Supplied with pin gage for zero setting

Dynabrade 14265 Dynangle Contact Arm Assy
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Dynabrade 64256 Replacement Grip Top for 64201
Dynabrade 62842 Raptor Vac Dust Extraction Arm, w/ 13" x 19" Hood
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Dynabrade 11026 1/2" W x 7" L DynaPad Hard Platen Pad 5-Pkg.
Dynabrade 51810 .1 hp Straight-Line Pencil Grinder, Rear Exhaust, 1000,000 RPM, 1/8" Collet
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Dynabrade 11399 Type 27 Wheel Mounting Adapter Kit
Dynabrade 51151 7" Dia. Disc Backup Pad, Medium Density, 5/8"-11 Thread 