Fowler 52-248-001 Fine Quality Outside Metric Micrometer, Friction Stop Thimble, 0-25mm Measuring Range, 0.001mm Accuracy, 0.01mm Graduation Outside micrometer with flat anvil/spindle pair and a choice of measuring range for general purpose measuring Vernier scale with 0.01mm graduations and 0.001mm accuracy for precise readings Hardened, precision-ground, and carbide-tipped anvil and spindle have 6.5mm measuring faces with micro-lapped finish, 0.00076mm flatness and 0.000125mm parallelism for accurate measurements Hardened, ground and lapped spindle thread provides smooth movement, accuracy, and long life Friction or ratchet-stop thimble provide exact and repetitive readings