Methods and systems for characterizing actual tool usage based on measurements of tool activity are presented herein. In some embodiments, a power tool usage auditor (PTUA) includes a sound measuring device offset from the surface of a power tool. The sound measuring device senses sound waves emitted from the surface of power tool and generates an electrical signal indicative of the sound emitted from the surface of the power tool. In some other embodiments, a PTUA includes a magnetic field measuring device that senses changes in magnetic field induced by motion generated by the power tool. A processor is configured to receive electrical signals indicative of tool activity and generate a signal indicative of actual tool usage. Furthermore, methods and systems for communicating an indication of actual tool usage to a user or another computing system without interfering with the operation of the tool are also presented.
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