Outer diameter micrometer - An external dimensions measuring instrument that measures the distance between the two sides of the square frame using the helix principle - Mainly used for measuring a variety of external dimensions - Benefits - Provides accurate and repeatable external measurements - Facilitates quick checks of part size in a workshop or quality control setting - Simple, robust square-frame design suitable for routine gauging - Key attributes - Function: measures external dimensions across a square frame - Performance: precise measurement based on the helix principle - Compatibility: designed for standard external dimension measurement tasks - Use scenarios 1) Inspect outer dimensions of shafts, pins, bolts, and other cylindrical or square features in machining QA 2) Check the width or thickness of machined blocks or plates during setup and inspection 3) Verify consistency of external sizes across parts in a production run