The Kryo-Bots is the perfect solution for LN2 dispensing.  Easily moved between rooms, its stores and automatically decants LN2 to the instrument or tool by simply pressing of a button.  For completely automated control, the target dewar can be integrated with the KIC level sensor.  Simply connect the instrument to the Kryo-Bot and it will maintain a constant level based on volume or by timing routines.  Never let your tool run dry, let the Kryo-Bot do the work for you!