diff --git a/pytec/tec_qt.py b/pytec/tec_qt.py
index 16f6b7d..08dc007 100644
--- a/pytec/tec_qt.py
+++ b/pytec/tec_qt.py
@@ -227,6 +227,8 @@ class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
             time_axis.showLabel()
             graph.setAxisItems({'bottom': time_axis})
 
+            graph.add_crosshair(pg.mkPen(color='red', width=1), {'color': 'green'})
+
         for graph in self.ch0_t_graph, self.ch1_t_graph:
             temperature_axis = LiveAxis('left', text="Temperature", units="°C")
             temperature_axis.showLabel()