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 78585 1/4" Dia. x 1-1/2" W x 1/8" Center Hole, 120 Grit, 100/pack
3M 01875, Charge-Collection Solar Tape 3011, 2 mm x 1200 m, 7010312686 
