I am interested in a part counter that will count the parts on a tabletop conveyor and stop the motor at a predetermined number.  The counter should go up to 999.  This would be a photoelectric counter if possible, though a limit switch could also work.  Do you have anything such as this?  The output signal to stop the motor could be to a relay, or other switch,  as the motor will likely be a 12 volt DC motor or an AC motor with a relay.