1. Before printing, ensure that page scaling is set to “none” on your print dialog box so you are printing the document at actual size. Internet Explorer or Google Chrome are recommended. If using Firefox, we suggest you save the file to your computer and then print it.2. Once printed, measure the bar on the left to ensure it is exactly one inch long.3. If measurement is not accurate, check that you are printing the page at actual size by reviewing your “print preview” and “page setup” features with your printer.4. If you are still having trouble with the measurement, call us at 1-800-243-4664 and we will send you a ring sizer.