The ACCUD 324-004-01 Outside Inch Micrometer is a precision measuring instrument designed for accurate and reliable measurements. With a measuring range of 3 to 4 inches and a graduation of 0.0001 inch, this micrometer allows for precise measurements down to ten-thousandths of an inch. Its carbide measuring faces provide superior wear resistance and durability, ensuring consistent and accurate readings over extended use. The ratchet stop mechanism ensures smooth and controlled operation, preventing over-tightening and potential damage to the workpiece or the micrometer itself. Ideal for machinists, engineers, and precision manufacturing applications, this outside micrometer is a must-have tool for anyone requiring precise dimensional measurements in the 3 to 4 inch range. While compact and easy to handle, it offers the accuracy and reliability expected from professional-grade measuring equipment.