Sorry, edited to be calc-u-dri.  It will turn the metering rolls at 3 different speeds.  For example, if it's set to 16%.  If the sensor reads 15.7-16.3 it runs on main speed.  If it's over 16.3 it runs on low speed.  If it's under 15.7 it runs on high speed.  I have it set to 15% difference between the speeds.  It will print the current readings every 5 minutes.  Goal is to set it to run on main the majority of the time.