Proper foot measuring is important and not understanding how to do this can mean the difference between comfort and pain. Many people have seen a Brannock Device, but few know how to use it correctly. This video teaches you how make sure your shoe salesperson is doing it right. 80% of my patients measure longer heel-to-ball than heel-to-toe. If you also measure longer heel-to-ball then using one finger beyond the longest toe method will not work for you and your shoe will not fit as well as it should.
Here are my previous posts on measuring feet which together with the video should give you a comprehensive overview on how to properly measure your feet.