diff --git a/electrode_check.py b/electrode_check.py
index 46e05f0..4ed71ed 100644
--- a/electrode_check.py
+++ b/electrode_check.py
@@ -50,6 +50,13 @@ class plot():
 
     def keypress(self, event):
         if event.key == 'v':
+            yrange = np.abs(np.diff(self.axs[0].get_ylim()))
+            for ax in self.axs:
+                ax.set_ylim(-(yrange / 2) * (2/3), (yrange / 2) * (2/3) )
+        if event.key == 'V':
+            yrange = np.abs(np.diff(self.axs[0].get_ylim()))
+            for ax in self.axs:
+                ax.set_ylim(-(yrange / 2) * (3/2), (yrange / 2) * (3/2) )
             print('v pressed')