This zero to one inch capacity Digital Outside Micrometer features a crisp, clear, easy-to-read LCD and provides measurements with an accuracy to +/- .00016 inch and repeatability to .0001 inch. Reads to .00005 inch or .001 mm. Auto Off feature saves your battery by shutting the display down after 5 minutes. Includes CR2032 3V battery and a handy protective storage case. An extemely useful tool to have when precision measurement is a requirement and not an option.