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 17181, Scotch-Brite Roloc Unitized Wheel Pack 987S, 2 in, 7000144150
3M 19765, Utility Cloth Sheet 314D, 9 in x 11 in P280 J-weight, 7000000353
3M 26106, PPS Series 2.0 Adapter, Type S22, 8 mm Male, 0.75 mm Thread, 7100135958
Insize 1120-3001WL, DIGITAL INSIDE GROOVE CALIPER, 1.97-12"/50-300mm, buit-in wireless, 6928640384844
3M 09215, Disc Pad Holder, 1-1/2 in 1/4 in Shank, 7000120559
3M 29611, 641WY 1/4" X 24", 100 Mesh Diamond Cloth Belt, 7010534832
Dynabrade 78582 1/4" Dia. x 1" W x 1/8" Center Hole, 180 Grit, 100/pack
3M 45095, Roloc Disc Pad TR, Medium 2 in 1/4-20 Internal, 7000045282
3M 45710, Cubitron II Hookit Cloth Disc 947A, 120+ X-weight, 6 in x NH, Die 600Z, 7100113139
Dynabrade 94992 1/4" Male Composite-Style Coupler with 1/4" Male Plug Assembly
3M 97419, Aluminum Foil Tape 3380, Silver, 48 mm x 45 m, 3.25 mil, 7000049613 