Abstract: The present invention relates to a system and method of remotely sensing the fill level of liquefied gas within containers. There are many gas types which are compressed into liquid form to fit into many sizes of cylinders for many purposes. Principal gas types are nitrogen, oxygen, carbon dioxide, argon, hydrogen, helium, and acetylene. More specifically, this invention relates to an apparatus and method of remotely determining the remaining liquefied gas which is present in the cylinder and reporting it through an internet website or messaging system to the business responsible for keeping the cylinder filled. The chief benefit of the system is to eliminate two situations; 1) a replacement tank is dispatched when none is needed, and 2) the user of the tank, i.e. a restaurant, runs out of gas and there is no replacement gas available for some time. Both situations cause customer aggravation or increased costs.