diff --git a/src/gui/configtool/graphicWidget.py b/src/gui/configtool/graphicWidget.py
index c545e71..6a7c452 100644
--- a/src/gui/configtool/graphicWidget.py
+++ b/src/gui/configtool/graphicWidget.py
@@ -51,7 +51,7 @@ def __init__(self, parent=None):
             # define signal plot data array
             self.signalDataArrays.append(np.zeros(self.numberOfSamples))
             # configure signal plot parameters
-            signalPen = pg.mkPen(color=sigColor, width=1.5)
+            signalPen = pg.mkPen(color=sigColor, width=1)
             self.signalPlots.append(pg.PlotDataItem(self.timeArray,
                                             self.signalDataArrays[-1],
                                             pen=signalPen, name=tooltip))
@@ -261,4 +261,4 @@ def updateMonitorVariables(self):
                                                  self.signalCheckBox[3].isChecked(), 
                                                  self.signalCheckBox[4].isChecked(), 
                                                  self.signalCheckBox[5].isChecked(), 
-                                                 self.signalCheckBox[6].isChecked()])
\ No newline at end of file
+                                                 self.signalCheckBox[6].isChecked()])