With the Mitutoyo 103-139-10 outside micrometer, you measure external dimensions from 50 mm to 75 mm with absolute accuracy. Thanks to the 0.01 mm graduation and integrated ratchet stop, you apply uniform measuring force for dependable, highly repeatable readings during machining, turning, or quality inspections. The wear-resistant carbide-tipped measuring faces on the spindle and anvil maintain precision throughout demanding workshop use. Secure your readings easily with the spindle lock, and verify your zero point using the included reference setting standard.