Mitutoyo Tube Micrometer w/ SPC Output Designed to measure the wall thickness of various tubing. Specifications include... 0-1" / 25.4mm Measuring Range 0.00005" / 0.001mm Resolution + 0.00015" Accuracy Spherical Post Dimensions... 0.272" Bottom Post Diameter 0.157" Center Post Diameter 0.185" Spherical Ball on Top 0.500" Height of Post from Bottom of Center Post to Centerline of Spherical Ball on Top Features include... Carbide Tipped Measuring Face Ratchet Stop for constant force SPC Output Supplied in fitted case IP65 Rated Protection