diff --git a/script/camtool.py b/script/camtool.py
index fbed0b1..4f44511 100644
--- a/script/camtool.py
+++ b/script/camtool.py
@@ -64,17 +64,17 @@ class CamTool(DeviceBase):
         self.com_y_mean = CamToolComY(); self.com_y_mean.camtool = self
         class CamToolComXVar(Readable):
             def read(self):     
-                return variance(self.camtool.com_x_samples)
-        self.com_x_var = CamToolComXVar(); self.com_x_var.camtool = self
+                return stdev(self.camtool.com_x_samples)
+        self.com_x_stdev = CamToolComXVar(); self.com_x_stdev.camtool = self
         class CamToolComXVar(Readable):
             def read(self):     
-                return variance(self.camtool.com_y_samples)
-        self.com_y_var = CamToolComXVar(); self.com_y_var.camtool = self
+                return stdev(self.camtool.com_y_samples)
+        self.com_y_stdev = CamToolComXVar(); self.com_y_stdev.camtool = self
         
         set_device_alias(self.com_x_mean, name + " com x mean")
         set_device_alias(self.com_y_mean, name + " com y mean")
-        set_device_alias(self.com_x_var, name + " com x variance")
-        set_device_alias(self.com_y_var, name + " com y variance")
+        set_device_alias(self.com_x_stdev, name + " com x stdev")
+        set_device_alias(self.com_y_stdev, name + " com y stdev")
 
     def doInitialize(self):        
         if self.latch: