Tooluxe 20724L Xenon Automotive Inductive Timing Light | Foreign and Domestic Engines Checks for electronic advance/retard, centrifugal advance, vacuum advance, no-spark, distributor cam wear, and more Works on all foreign and domestic 12V gas engines; Clamp-on inductive pickup is trigger activated and accurate at all speeds Dependable solid-state circuitry, automatic reverse polarity and overload protection to protect the user Uses clamp-on inductive pick-up; timing light connects to 12V battery terminals and does not require batteries to operate Includes: high impact housing, 4-ft electrical wire clamp and 4-ft test electrical wire; uses bright xenon bulb to make timing mark easier to see