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 51301 .5 hp Straight-Line Die Grinder
Dynabrade 96101 Dynabrade Air Lube 10W/NR 24 Per Box
Insize 1120-3001, DIGITAL INSIDE GROOVE CALIPER, 1.97-12"/50-300mm, 6928640384837
3M 15041, Scotch Electrical Shielding Tape 24, 1 in x 15 ft (25 mm x 4,6 m), 7000031348 