The Starrett 769 Series Electronic Tube Micrometer is used for measuring the wall thickness of tubing and other materials that have cylindrical walls. This tool is also used for measuring from hole-to-edge. Built with customary Starrett quality and workmanship, the 769 series includes a large, easy-to-read, high-contrast LCD digital readout for clear readings. Its no-glare satin chrome finish minimizes annoying surface glare under bright lights indoors or filters out UV light. This model features 0.00005"in & 0.001mm resolution and 0-1"in & 0-25mm measuring range. Starrett electronic micrometers guarantee a precise measurement at every position each and every time. 0-1" (0-25mm) Range with Output, Carbide Spindle time.