This timing light includes a full range of options designed to meet the demands of DIYers with many of the features that professional installers demand. This digital timing light is for most 12-volt gasoline engines and works on conventional, electronic, and computer controlled ignition systems. It also works on both domestic and import vechicles. It has a split-screen digital LCD readout which displays tachometer and advance functions simultaneously from 249-9,990 RPM and digital advance from 0-90 degrees. This timing light provides a simple and efficient means of checking your vehicle's ignition timing and provides the additional ability to check the operation of your vehicle's mechanical or vacuum advance timing controls. It includes a rotating barrel for better aim at the timing mark, detachable leads, metal inductive pickup, and protective hand guard. It also has a patented skip circuitry test up to 9,990 RPM.