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 11312 Contact Arm Ass'y, 5/8" Dia. x 3/8" W, Rubber Wheel, H.D. Version of 11203 Arm
Dynabrade 64861 Variable Speed Versatility Grinder, Slack-Action, 1 hp, 120 V (AC), 1 Phase, 50/60 Hz, 600-4,000 SFPM, for 1/4"-2" W x 72" L (6-51 mm x 122 cm) Belts
Dynabrade 54369 .7 hp Right Angle Die Grinder, Rear Exhaust, 12,000 RPM, 1/4" Collet
Dynabrade 45263 Safety Throttle Lever
Dynabrade 57397 Wiper Retainer
Dynabrade X62VHS 6" Dia. Vacuum Dynorbital Extreme Random Orbital Sander, Hook Pad W/ Speed Regulator
Dynabrade 48345 .4 hp Straight-Line Die Grinder, Rear Exhaust, 30,000 RPM, 1/8" Collet
Dynabrade 91118 1/2" W x 18" L 80 Grit A/O DynaCut Belt, 50/pack
Dynabrade 11213 Contact Arm Ass'y, 5/16" Dia. x 3/8" W, Steel Wheel, with 1/2" W Platen
Dynabrade X3161H - 3" Mini Extreme & 6" Extreme Random Orbital Sander, with Hook Pad, Non Vac, Combo Kit 12,000 RPM, 3/16" Dia., Rear Exhaust
Dynabrade 57364 Shaft Balancer
Dynabrade 21457 ND3071, Red Plastic Cover
Dynabrade 11605 1" W x 7" L Hard Platen Pad 5-Pkg.
Dynabrade 02649 Bearing
Dynabrade 51124 Collet, M8 x 1.0 Female Thread, 1/4" Capacity
Dynabrade 79035 3/4" W x 18" L 60 Grit A/Z DynaCut Belt, 50/pack
Dynabrade X51 5" (127 mm) Dia. Non-Vacuum Dynorbital Extreme Random Orbital Sander, .3 HP, 12,000 RPM, 3/16" Orbit, PSA
Dynabrade 57400 2-3/4" (70 mm) W x 8" L Dynaline Sander, Non-Vacuum
Dynabrade 91542 5" Dynacut Extreme Orange Premium Film Disc, 320 Grit, Hook & Loop, Vacuum Holes, 50/Box
Dynabrade 78143 6" Dia. x 1/2" Center Hole, Extra Coarse, DynaStrip Disc 