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. It also provides the additional ability to check the operation of your vehicle"s mechanical or vacuum advance timing controls which ensure that ignition occurs at the proper time. It is designed for use on all 12-volt negative ground vehicles equipped with conventional breaker point and electronic ignition systems or with distributorless ignition systems. It also helps advance dial enables user to check base timing, mechanical advance or retard, and electronic advance or retard applications. Includes a rotating barrel for better aim at timing mark, detachable leads, metal inductive pickup, and protective hand guard.