Thanks for an easy question I can answer to.
Visio 2003.
Menu, File, Shapes, Visio Extras, Drawing Tool Shapes.
More elaborate answer :
Of course you could have searched for the shape "measure". But you may
encounter problems in this.
Many beginners would search in the Visio Help system, and not in the Shapes
window, Search for Shapes box. It would be great if I could give you
unambiguous instructions like : menu, Tools, Search for Shapes.
Secondly, when you have found the the shapes, you don't know in which
stencil to find them. There is a little known, well hidden feature : menu,
Tools, Options, Tab "Shape Search", Section "Results", check "By Group".
This will give you the name of the stencil in the results pane. Even without
the name of the folder the stencil is in, the stencil will be easy to find,
as they are sorted alphabetically.