In addition to the activities, the {\it Raising Calculus to the Surface} materials consist of four different types of tools:
\begin{enumerate}
\item
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%\item The Surfaces
\item
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%\item The Contour Plots and Coordinate Grids
\item
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%\item The Inclinometer
\item
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%\item The Vertical Measurement Ruler
\end{enumerate}
Key features of each tool are described in these sections. The
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section describes how to care for these tools.
%Key features of each tool are described in these sections. The Care section describes how to care for these tools.