The Starrett No. 436 Outside Micrometer is a precision tool used for measuring outside dimensions with a minimum measurement of 1 inch and a maximum measurement of 2 inches. It features a mechanical reading system with a resolution of 0.0001 inches, making it ideal for accurate measurements in metalworking and manufacturing processes. The Starrett brand ensures quality and reliability in this essential tool for CNC machining, inspection, and measurement tasks.