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

3M 28864, Finesse-it Knit II Buffing Pad, 28864, 7 in, 1/2 in Pile Height, 10 ea/Case, 7100081911 