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+.TH RULER 9.1
+.CT 1 comm_term
+.SH NAME
+ruler \- measure things on the screen
+.SH SYNOPSIS
+.B ruler
+.SH DESCRIPTION
+.I Ruler
+measures things on a
+.IR mux (9.1)
+screen.
+Press button 1 to sweep out a rectangle anywhere on the screen.
+For each rectangle swept,
+.I ruler
+displays the coordinates of the rectangle's corners (labeled
+.B down
+and
+.BR up ),
+the size
+of the rectangle and length of its diagonal.
+.LP
+There is
+a menu on button 3.
+The
+.B pixels
+and
+.B chars
+items control whether the size and diagonal are measured
+in units of pixels or characters;
+.B stop
+deactivates
+.I ruler
+without exiting;
+.B measure
+reactivates
+.IR ruler .
+.SH BUGS
+Character units are arbitrarily defined as the width and height of a 
+.L 0
+in the
+.I ruler
+layer.
+This may have nothing to do with character sizes in other layers.
+.br
+Ruler's menu must pop up in its own layer, perhaps far
+away from the cursor.