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 78592 3/8" Dia. x 1" W x 1/8" Center Hole, 120 Grit, 100/pack
3M 19892, Neoprene High Performance Contact Adhesive 1357, Gray-Green, 1 Quart Can, 7000046324, 12/case
3M 34411, Flexible Diamond Hand File 6210J, 1-3/4 in x 1/2 in M74 Micron, 7000082159, 10 per box
3M 27309, Ultra Durable 5 inch Power Sanding Discs, Universal Hole, 100 grit, 7100187644, 10 per pack
Standard Abrasives 541034, Track Mandrel, 3/4 in x 1/4 in Shank, 7000121718
3M 97957, Hi-Strength Spray Adhesive 90 CA, Low VOC <25%, Clear, 24 fl oz Can (Net Wt 19.0 oz), 7000121418, 12/Case
3M 97421, Aluminum Foil Tape 3380, Silver, 72 mm x 45 m, 3.25 mil, 7010375681
3M 97419, Aluminum Foil Tape 3380, Silver, 48 mm x 45 m, 3.25 mil, 7000049613 