Index: digitalmultimeter/trunk/digitalmultimeter.py
===================================================================
--- digitalmultimeter/trunk/digitalmultimeter.py	(revision 2)
+++ digitalmultimeter/trunk/digitalmultimeter.py	(revision 4)
@@ -179,5 +179,5 @@
 
     def readline(self):
-        data = [ord(x) for x in serialport.read(9)]
+        data = [ord(x) for x in self.serialport.read(9)]
         timestamp = time.time()