Scan Tools
A professional scan tool plugs into the vehicle's diagnostic port to read codes, view live data, run bidirectional tests, and in many cases code keys or program modules. General repair shops, fleets, and mobile diagnosticians all depend on them. When you compare platforms, look at vehicle coverage for the makes you see most, how often the software updates, and whether the tool supports secure gateway access on newer vehicles. Ask about the cost of the annual software subscription, since an expired tool quickly falls behind. Used scan tools can be a bargain, but confirm the software license transfers to you.