I've always used the tried and true old 6 inch screen. but sometimes it left me with a little longing. If you need a full 8 inches, this is your ruler. Always satisfied. The markings are fairly clear and easy to read - white on black is ideal for visibility. This is my first "centering" ruler - I've since bought another, longer one. I don't know why I've never heard of them before in my life, they really are amazing.