diff --git a/ilt1000.py b/ilt1000.py
index 100043c..e28d95d 100755
--- a/ilt1000.py
+++ b/ilt1000.py
@@ -27,7 +27,6 @@ class Saturated(Error):
 
 # TODO commands:
 # eraselogdata
-# getfactorydark
 # getlogdata
 # getuserdark
 # set100perc
@@ -161,6 +160,13 @@ class ILT1000(object):
   def GetDarkMode(self):
     return int(self._SendCommand('getdarkmode'))
 
+  def GetFactoryDarkVoltages(self):
+    # SPEC ERROR
+    # Actual return value sample:
+    # R1 12149 9733 9251 R2 12476 10080 9604 R3 13940 11894 11435
+    ret = self._SendCommand('getfactorydark')
+    return [float(x) / 1000000 for x in ret.split()]
+
   def GetIrradiance(self):
     ret = self._SendCommand('getirradiance')
     return float(ret) / 1000