This probably falls under the "duh" category, but I just want to be certain before I go through the effort to calibrate my monitor's geometry that I'm doing it correctly.
When using a crosshatch test pattern I assume the squares should be true squares (equal width and height, for example 1cm wide by 1cm tall) and not rectangles with a 4:3 aspect ratio (for example 4cm wide by 3cm tall)?
I plan on using in-game test mode cross hatch test screens to calibrate my monitor (unless someone has a better or easier way they want to share).