Not sure what your monitor size is ?
Monitor Size: Unknown
1 foot ruler
Cm storm sentinel advance
1 inch circle
1 euro coin
Weigh it multi use advanced digital luggage scale
I am using a 19" monitor at 16:10 aspect ratio (1440x900); it is correct even when changing resolution while keeping the aspect ratio the same. I have no idea if aspect ratio matters, but also keep in mind to have the page at 100% zoom (I remembered I kept the browser at 90% zoom as default).
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