Abstract: The invention uses the electronic scale and the computer to track tool inventories. Users weigh tools (including the tool box) before and after performing mechanical or other critical work. Discrepancies between the two weights are noted by a supervisor or optional computer software. To aid in the resolution of weight discrepancies, software can be used to search a database and suggest which tool may have been left behind. Any tool weight discrepancies, which could be a decrease or increase in weight for the second weighing, must be addressed and resolved before the maintenance work is safely completed. The invention has applications in areas where strict inventory of tools and equipment must be maintained such as the medical and dental fields, other safety-related mechanical work, and tracking of tools going into and out of penal institutions. Leaving tools behind or removing parts during maintenance work can result in unsafe operating conditions and/or operating failure.