How to determine your printer resolution (dpi = dots per inch)
If you do not know your printer resolution (dpi = dots per inch), you can determine it as follow:
First print this page on the printer where you want its printer resolution to be known, by pressing this button:
Take your ruler and measure the line length, in millimeters or inches, from the printed page.
Do NOT measure the length from your computer / laptop screen.
Enter the line length and select the measurement unit. Press the Calculate button to determine the printer resolution.