This vintage Starrett No. 231 outside micrometer is a precision measuring tool made in the United States. It has a ratchet thimble and a resolution of 0.0001 inches, making it perfect for measuring small objects with maximum and minimum measurements of 1 inch and 0 inches respectively. The mechanical reading makes it easy to use for professionals in the CNC, metalworking, and manufacturing industries.

This micrometer is of high-quality and is perfect for those who require accurate and precise measurements. It is a great addition to any metalworking inspection and measurement toolset. Get your hands on this vintage Starrett tool now and have the peace of mind that it will provide you with reliable results every time.