The Insize 3109 Digital Outside Micrometer delivers fast, precise measurements for machinists, quality control professionals, and workshop technicians who value reliability and ease of use. Designed for one‑hand operation with a ratchet thimble, it combines a streamlined digital readout with durable carbide faces to handle repetitive gauging tasks with confidence.

• Resolution: 0.001 mm / 0.00005" for dependable, fine measurements
• Measurement range: up to 100 mm (4") to cover a wide range of small to mid-sized parts
• Carbide measuring faces: wear‑resistant and long‑lasting for repeated use
• Digital display: clear, immediate readings that minimize parallax errors
• Unit and mode controls: easy on/off, set, mm/inch, and ABS/INC for flexible workflows
• Ratchet thimble: consistent measuring force and comfortable one‑hand operation
• Spherical anvil: enables stable contact on curved or irregular external surfaces
• Battery compatibility: powered by SR44 or LR44 batteries for convenient replacement
• Calibration support: includes setting standards to verify accuracy straight out of the box

This digital outside micrometer helps you speed up inspection routines without sacrificing accuracy. The carbide faces resist wear for longer life, while the spherical anvil expands the range of measurable shapes. With metric and imperial options, as well as a reliable ABS/INC measuring mode, it integrates smoothly into any shop that switches between measurement systems. Calibrate with the included standards to maintain consistent performance across your production or quality assurance processes.