diff --git a/ilt1000.py b/ilt1000.py
index 423910c..2556aa2 100755
--- a/ilt1000.py
+++ b/ilt1000.py
@@ -28,7 +28,6 @@ class Saturated(Error):
 # TODO commands:
 # eraselogdata
 # getlogdata
-# set100perc
 # setautaveraging
 # setcurrentloop
 # sethiaveraging
@@ -153,6 +152,12 @@ class ILT1000(object):
     ret = self._SendCommand('get100perc')
     return float(ret)
 
+  def Set100PercentVoltage(self):
+    # SPEC ERROR
+    # Spec says microvolts, but actual values appear to be in volts.
+    ret = self._SendCommand('set100perc')
+    return float(ret)
+
   def GetDarkMode(self):
     return int(self._SendCommand('getdarkmode'))