--- a/m209/key_wheel.py	Tue Jun 04 18:49:12 2013 -0500
+++ b/m209/key_wheel.py	Tue Jun 04 19:31:37 2013 -0500
@@ -50,6 +50,15 @@
         # rotational position; 0 means first letter shown to operator
         self.pos = 0
 
+    def __str__(self):
+        parts = []
+        for n, c in enumerate(self.letters):
+            if self.pins[n]:
+                parts.append(c + '-')
+            else:
+                parts.append('-' + c)
+        return ' '.join(parts)
+
     def reset_pins(self):
         """Reset all pins to the ineffective state."""
         self.pins = [False] * self.num_pins

--- a/m209/tests/test_key_wheel.py	Tue Jun 04 18:49:12 2013 -0500
+++ b/m209/tests/test_key_wheel.py	Tue Jun 04 19:31:37 2013 -0500
@@ -105,3 +105,8 @@
         for c in letters:
             kw.set_pos(c)
             self.assertEqual(c, kw.display())
+
+    def test_str(self):
+        kw = KeyWheel(string.ascii_uppercase, 'P', 'FGIKOPRSUVWYZ')
+        self.assertEqual(str(kw), ('-A -B -C -D -E F- G- -H I- -J K- -L -M -N '
+                                   'O- P- -Q R- S- -T U- V- W- -X Y- Z-'))