Cover the most vehicles. If your car's Check Engine Light is on, you need this device. V-checker is a handy device for reading and erasing trouble code in your vehicles. It can also display live data for your vehicle. It is small in size, robust in design, competitive in price and easy to use. This is a stand alone unit, it does not need a laptop computer to operate. By simply connecting V-checker with the diagnostic socket, the user will be able to read the trouble code. The trouble code description will be displayed directly on the screen, no need for search it in the user's manual. Each code will be continuously displayed until the [PREVIOUS] or [NEXT] key is pressed. This is a important advantage to compare with the old type trouble code reading tools.