I have just installed LibreOffice 5.2.4.2 on a Dell XPS 15, running Windows 10. The vertical and horizontal rulers have markings all over the place, and the one measurement number displaying in the middle is not 4 inches, but rather “4.00000000001” inches. There also appear to be “center tab” markings every half-inch or so.
I have a screenshot if someone can tell me how to upload one of those.