Fowler 52-235-001-1 52-235 Series Advanced Design Outside Inch Micrometer, 0-1" Measuring Range, 0.0001" Accuracy Outside micrometer with choice of measuring range and flat anvil/spindle pair for general purpose measuring Vernier scale with 0.0001" graduations, 0.0001" accuracy, and metric equivalents inscribed on the frame for precise readings Hardened and precision-ground anvil and spindle have micro-lapped carbide measuring faces with 0.00005" parallelism on 0 to 1" micrometers and 0.00003" flatness for wear resistance and accurate measurements Ratchet stop applies constant force for repeatability between users Satin chrome finish with contrasting black microfine graduations on thimble and sleeve helps resist rust and reduce glare for accurate reading