Digital Radius Gage Set Measure radius of external arcs, arc angles of measured surface should be larger than 60°. Instantly displays radius value, eliminates the need to perform a calculation. Features include... 0.16" - 2.09" / 4-53mm Measuring Range 0.0005" / 0.01mm Resolution + 0.001" Accuracy Data Output Capable 2.559" Long Stainless Steel Base 0.591" Width Includes Pin Gage for zero setting Buttons include... on/off, inch/mm, zero, data preset