\documentstyle{article}
\pagestyle{empty}

\oddsidemargin  0pt     
\evensidemargin 0pt
\marginparwidth 1in
\marginparsep 0pt

\topmargin 0pt
\headheight 0pt
\headsep 0pt
\topskip 0pt

\footheight 0pt
\footskip 0pt
\textheight 6in
\textwidth 6in

\setlength{\unitlength}{1in}
\newcounter{foo}
\begin{document}
\parindent 0pt
\begin{picture}(0,0)
\scriptsize

\put(0,-1){\framebox(1,1){}}
\end{picture}
\vskip1.5in

The above figure is a square of size 1 inch (= 25.4 mm) x 1 inch.

Adjust the printed position so that the left upper vertex of the 
square locates at the 1 inch right and lower point from the left upper 
edge of the sheet.
\enddocument

