Tools TechTool Pro includes a number of tools that you can select from the Tools category. These include: Video —monitor calibration and iSight verification Audio —manipulate and monitor the audio signal Select a tool from the list to display its configuration screen on the right. Tools cannot be queued on the dock like Tests, since they cannot be interrupted while they perform their individual functions. The various tools are described in detail below. If you ever have trouble with your normal startup volume, you can simply restart your computer from the eDrive. This will give you immediate access to the tools you need for recovery and repair.