Vernier ratchet is used to stop or friction thimble for exact, repetitive readings. Includes a standard bar except for 0" to 1" and 0 to 25mm models.Specification: Item: Outside MicrometerResolution: 0.001"Range: 0 to 1"Thimble: RatchetLong Form Calibration Certificate: NoAnvil: FlatSpindle: FlatLock Nut Type: LeverFeatures: Enamel Frame, Vernier Scale"