Dynabrade 52402 2" (51 mm) Dia. 7 Degree Offset Disc Sander, Front Exhaust, .5 HP, 20,000 RPM, 1/4"-20 Thread 
Insize 2188-55, DIGITAL RADIUS GAGE, .16-2.09″/4-53mm, 6928640381911
$436.70
Resolution .0005″/0.01mm
Measure radius of external arc, arc angle of measured surface should be larger than 60?
Display radius value, no need to calcuate
Button function: on/off, zero, data preset, inch/mm
Keep preset data and tolerance data in memory after restart.
CR2032 battery, automatic power off
Stainless steel base
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