The present disclosure relates to an inventory system that can include a tagged inventory item, wherein the tagged inventory item includes a radio field tag attached to an inventory item; and an inventory device, wherein the inventory device includes a weighing surface, an array of force sensing resistors, and at least one radio field antenna, wherein the array of force sensing resistors and the at least one radio field antenna are configured to weigh and identify the tagged inventory item through the weighing surface, and methods of using the same. One benefit of the system and method disclosed herein can be monitoring inventory having changing amounts of content in real time.