Digital Radius Gage Set Measure radius of external arcs, arc angles of measured surface should be larger than 90°. Features include... 0.079"-0.394" / 2-10mm Measuring Range 0.0005" / 0.01mm Resolution + 0.002" Accuracy Data Output Capable Includes Pin Gage for zero setting Buttons include... on/off, inch/mm, zero, data preset