Fowler 52-235-101-1 Advanced Design Outside Metric Micrometer, 0-25mm Measuring Range, 0.00254mm Accuracy, 0.001mm Graduation Outside micrometer with choice of measuring range and flat anvil/spindle pair for general purpose measuring Vernier scale has 0.001" graduations for precise readings and accuracy of 0.001" for precise readings and accurate measurements 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 Friction or ratchet-stop thimble provide exact and repetitive readings Satin chrome finish with contrasting black microfine graduations on thimble and sleeve helps resist rust and reduce glare for accurate reading