This Starrett Digital Bore Micrometer Set is an indispensable tool for anyone in the CNC, Metalworking & Manufacturing, or Business & Industrial fields. Measuring between 3/8in and 3/4in, the electronic reading with a resolution of 0.00005 in is sure to provide accurate readings each time. The bore micrometer is perfect for measuring the inside diameter of a hole, making this tool a reliable and functional addition to any toolkit. The high-quality Starrett brand makes this digital bore micrometer a must-have for anyone serious about their craft.