%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 8-1-1 on page 515.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.83385pt}

\StartShownPreambleCommands
\usepackage[cdot,thickqspace]{SIunits}
\StopShownPreambleCommands
\begin{document}
\providecommand\test{\unit{99}{\volt\usk\ampere}}
\begin{flushleft}
\test\\ % default:           thickqspace, cdot
\SIunits[thickspace]\test\\ %     "       thickspace
\SIunits[mediumspace]\test\\%     "       mediumspace
\SIunits[thinspace]\test\\  %     "       thinspace
\SIunits[thinqspace,cdot]\test%thinqspace,cdot
\end{flushleft}
\end{document}