example how to typeset pixel

documents/siunitx-pixel/Makefile

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+SOURCE = siunitx-pixel
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux *.out

documents/siunitx-pixel/README.md

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+Read the [manual](ftp://ftp.tex.ac.uk/tex-archive/macros/latex/exptl/siunitx/siunitx.pdf)
+for more information how `siunitx` works.
+
+Material
+--------
+* [Why use a package to typeset units?](http://tex.stackexchange.com/q/107818/5645)

documents/siunitx-pixel/siunitx-pixel.tex

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+\documentclass[a4paper,9pt]{scrartcl}
+\usepackage{amssymb, amsmath} % needed for math
+\usepackage[utf8]{inputenc} % this is needed for umlauts
+\usepackage[ngerman]{babel} % this is needed for umlauts
+\usepackage[T1]{fontenc}    % this is needed for correct output of umlauts in pdf
+\usepackage[margin=2.5cm]{geometry} %layout
+\usepackage{hyperref}   % links im text
+\usepackage[binary-units = true]{siunitx} % this package is for units!
+
+\DeclareSIUnit\px{px}
+
+\begin{document}
+My display has a resolution of $\SI{1366}{\px} \times \si{768}{\px}$.
+
+The speed of a modem is $\SI[per-mode=symbol]{57.6}{\kilo\bit\per\second}$
+\end{document}