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

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Dynabrade 11395 Guide Wheel
Dynabrade 54325 5" Dia. Non-Vacuum Disc Pad, Hook-Face, Short Nap
Dynabrade 59118 3" Dia. Central Vacuum HiVac Dynorbital-Spirit Random Orbital Sander, 3/32" Orbit
Dynabrade 78696 D8-6 Cartridge Roll Mandrel 1/8" Pilot Dia. x 3/4" Pilot Length, 1/4" Dia. Shank x 6" Shank Length
Dynabrade 56469 Exhaust Gasket
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Dynabrade 57369 Lip Seal Shroud 