This is why I strongly recommend that you manually calibrate this ruler using the options provided above.
ACTUAL SIZE RULER MEASUREMENTS FULL
Depending on the class and type of your device, the error in the original screen size value reported by your operating system may vary from a few millimeters to several centimeters (or even up to a full inch). This value is what is used to display this ruler the first time you visit this page. However, as earlier mentioned, your operating system does give us an “educated guess” about the physical screen size. And if the browser doesn’t know the physical screen dimensions, it is not possible for something running inside the browser (in this case JavaScript) to know the physical screen dimensions either. Technically speaking, there is really no way for the operating system running on a device to tell what the physical screen dimensions of the device are and so, there is no way for any program (like a browser) running on that operating system to tell the exact screen dimensions either. The reason for this has to do with browser and operating system constraints. It is merely proposed as an approximate value for consideration. The device size supplied by your browser may not correspond to the real size of your device in many practical cases. Your browser determines and exposes your screen resolution, but there is no way to be very sure about your monitor size (or the screen size of your phone or tablet) if you don’t explicitly select it. In order to display a ruler in its actual size, two details should be known: Why You Should Enter Your Screen Dimensions (Diagonal Screen Size)
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